Llansadwrn (Anglesey) Weather
Diary 2000
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Llansadwrn (Anglesey) Weather
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1st: The New Year started sunny with little or no wind. There had been a ground frost overnight (-0.8C) and there were frozen water deposits on the grass and thin ice on water. It was misty and visibility was moderate to poor but the first rays of the sun appearing over the top of the Carneddau mountains was seen at 0858 GMT. By 1300 GMT the temperature had risen to 7.5C and it was soon to rise further to 8.0C, the maximum of the day. It was sunny most of the day with only a little patchy cloud at 1550 GMT, nearly 7-h sunshine; sunset was at 1610 GMT. There was a clear sky with a SW'ly force 4 wind at 2200 GMT. [Rain 0.2 mm; Max 8.0C; Min; 3.1C; Grass -0.8C]
2nd: The day dawned with low cloud and light drizzle but there were signs of clearer weather at 0900 GMT. The morning was then bright and dry but became cloudier and windier later. A deep low in the Atlantic was moving NE and brought S'ly wind to gale force for a while in the evening. It was reported that a gust of 114 mph was recorded on Rona a small island to the NW of Cape Wrath in Scotland. [Rain 7.3mm; Max 10.1C; Min 3.3; Grass 0.1C]
3rd: A bright start to the day with a lot of cirrus, stratocirrus and some patchy cumulus clouds. There was mist and low thin cloud on the mountaintops through which the sun could be seen rising. It became cloudier later remaining dull, but dry, throughout the afternoon. It became windier, SW force 5-6, with showers later in the night. [Rain 3.0 mm; Max 7.7C; Min 5.0C; Grass 1.8C]
4th: After early showers at dawn there were low ragged clouds with a S'ly force 6. Thunder was first heard at 1025 GMT. At 1111 GMT there was a heavy squall with the wind veering W'ly and accompanied by ice pellets. This was soon followed by sleet and then snow for a while ( 3.7 mm since 0900 GMT). The temperature in the screen fell rapidly from 7.6C to 2.6C, although outside a minimum of 1.7C was registered on a digital probe, as the cold front passed. The grass minimum fell to 0.2C. Valley (Anglesey) reported gusts of 46 mph, a thunderstorm and snow at 0950 GMT. A tornado was reported from north-east Anglesey. At 1300 GMT the temperature had risen to 4.3C and the wind had veered further to WNW but eased to force 4. In the clearance following passage of the front the afternoon became sunny. Some cumulus clouds remained over the Snowdonia mountains. [Rain 3.9; Max 8.7; Min 4.0C; Grass 0.2C]
5th: A blustery start to the day. A S'ly force 7 wind was bring along showers of rain in the morning. It was mild with the temperature reaching 9.6C before 1300 GMT and going on to reach a maximum of 10.7C about 20 GMT, the highest of the month. Relative humidity was 74%, one of the 2 lowest readings of the month. The Piche evaporimeter recorded 2.2 mls over the 24-h period, the highest evaporation of the month. The afternoon was increasingly windy with the S'ly at gale force well into the evening. The HSS ferry to Ireland was cancelled. There was a shower of rain about 2000 GMT and the wind eased before midnight. [Rain 2.0 mm; Max 10.7C; Min 2.6C; Grass 0.2C]
6th: A dull start to the day with some light showers of rain. The cloud was low and ragged but there were signs of it clearing and it became bright by mid-morning. Another mild day with the temperature reaching 9.3C before 1300 GMT. There were very dark cumulus clouds to the S, with the sun behind the edges were outlined white and strong upward crepuscular rays were seen. Later in the afternoon the sky cleared and it was sunny but well developed cumulus clouds remained over the mountains. With the clearer sky it went cooler, at 1800 GMT the temperature had fallen to 4.0C. Later it became windier. [Rain 0.4 mm; Max 9.3C; Min 7.5C; Grass 5.6C]
7th: There was a red sky over the mountains at 0800 GMT. It was windy SW'ly force 6 with a temperature of 9.0C at 0900 GMT. The morning remained dry but the low cloud obscured any view of the mountains. At 1300 GMT it was blowing SSW'ly force 8 and the Britannia Bridge had been closed to high-sided vehicles. Valley was reporting mean wind speeds of 42 mph and gusts of 60 mph. At 1430 the wind had increased to force 9 and in one of the strong gusts 2 slates were removed from the roof of my house and were flung onto my car, parked only minutes before, damaging one of the doors! The gale continued for a while but eased when it started raining about 1600 GMT, in all a period of 4.2-h accumulating 8.2 mm. At 22 GMT there was a shower, which included some ice pellets and a small but rapid drop in temperature. [Rain 8.5 mm; Max 9.4C; Min 3.5C; Grass -0.5C]
8th: The sky had cleared by dawn, only 2 oktas mainly hanging over the mountains partially obscuring the summits. The morning was bright with good sunny spells. There was more cloud around 1430 GMT but the cleared later giving a clear view of the new moon low in the western sky and a starlit night. [Rain 0.0 mm; Max 7.3C; Min 4.6C; Grass 1.7C]
9th: It was almost calm first thing in the morning with just a little cumulus clouds on the horizon to the NE, SW and over the mountains to the S. There had been a slight hoarfrost and there was thin ice on water. The morning was sunny with just a little patchy cloud drifting over from the N from time to time. Around 1300 GMT there were some well-developed cumulus in the vicinity but it remained dry and they later dispersed. There was a red and then golden sunset at 1600 GMT but it was already freezing on the grass (-1.9C) but the minimum fell only to 1.8C. The new moon was later again seen setting in the west. By 2230 GMT cloud was encroaching and the temperature began to rise reaching 6.6C by morning. [Rain 0.0 mm; Max 7.6C; Min 1.6C; Grass -2.2C]
10th: After a calm night it began to become windy about 07 GMT. Another red sky over the mountains to the SE at 0808 GMT with a 'shepherd's warning'. The morning was mainly dry with just some specs of rain on the SSW'ly force 5 wind. By 1300 GMT it was raining slightly and this continued during the afternoon. During the night the rain was heavier and by morning had accumulated 25.8 mm over 16-h duration. [Rain 25.8 mm; Max 9.0 C; Min 1.8C; Grass -1.9C]
11th: It was still raining at 0900 GMT with a SW'ly force 5. Visibility was very poor. The rain eased and turned to drizzle during the morning before accumulating another 5 mm by 1200 GMT. The wind increased to gale force 8 at times in the afternoon and evening. Ferries to Dun Laoghaire from Holyhead were delayed or cancelled. A fishing boat with 7 crew, attempting to reach shelter, was reported missing off the Isle of Man. There was further moderate to heavy rain in the night accumulating 40.6 mm by morning over 21-h duration. This was the largest 24-h fall of the month and since the 40.7 mm on 10 January 1984. The previous largest fall was 44.2 mm on 8 December 1983. [Rain 40.6 mm; Max 9.2C; Min 6.5C; Grass 5.5C]
12th: Continuous moderate rain through the night and still falling at 0900 GMT. It was calm with very poor visibility. The ground is absolutely waterlogged with large pools of water on the surrounding fields. The percolate in lysimeter had overflowed 2 collecting vessels and there was water in the bottom of the receiver. This had to be absorbed by sponge and retained for measurement, at least the gale had ceased! The heavy rainfall on completely saturated soils has led to considerable runoff and flooding of roads to Llansadwrn. The river Cadnant draining into the Menai Strait was a torrent and flowing over the road at Llandegfan making it impassable. The A5111 at Llanerchymedd was reported flooded and the A5 to Holyhead was partially flooded in several places in the afternoon. At Gaerwen and Llanbedrgoch the floodwater reached all across the road. At Beaumaris the moat at the Castle had overflowed forming a large lake into Castle Street, threatening parts of the town and the local fire service was attending with pumps. The road between Beaumaris and Menai Bridge at Gallows Point was blocked by a landslide and fallen tree caused by the heavy rain. The A55 Expressway between Abergwyngregyn and Talybont was flooded and the A498 at Nant Gwynant was impassable to smaller vehicles. It was reported on TV that Capel Curig (Gwynedd) had recorded 137 mm rain in the 42-h to 1200 GMT. For the comparable period here the total was 70 mm. Further moderate rain in the afternoon added another 11.5 mm by 1800 GMT, 19.5 mm in total since 0900 GMT. Rainfall at Capel Curig since 09 GMT on Monday totals 163 mm. Here the total was 86 mm. It was still raining but turned to sleet for a while (the temperature at 21 GMT was 3.0C) but ceased before midnight. This added another 1.5 mm to the total for the day of 28.5 mm over 15.5-h duration. Over the 3 days 10-12th there was a total of 94.9 mm about the average rainfall for January. [Rain 28.5 mm; Max 6.3C; Min 5.9C; Grass 5.5C]
13th: The sky had cleared somewhat after midnight and there was a ground frost (-1.7C) with frozen water deposits on the grass and a thin layer of ice on water. Fresh snow had fallen on the mountains, moderate falls over the summits but a slight covering down to 1000 ft especially in the Nant Ffrancon Pass. It was a bright and sunny morning with a light N'ly breeze. Although still bright cumulus clouds became more developed in the afternoon producing some showers in the area. One shower containing ice pellets fell here about 15 GMT. It became cloudier from 1630 GMT with a shower of rain. Later the cloud thinned and the moon could be seen through the cloud at 1800 GMT. [Rain 3.3 mm; Max 6.0C; Min 0.7C; Grass -1.7C]
14th: A slight night ground frost (-0.2C). Signs of the cloud clearing and there were sunny spells throughout the day. The light wind remained N or NE'ly and it felt cold even in the sun. The maximum only reached 5.2C, the lowest of the month. A dry day. [Rain 0.0 mm; Max 5.2C; Min 1.4C; Grass -0.2C]
15th: The cloud was clearing from the NE and it was soon sunny with a light NE'ly breeze. With no rain since before 1800 GMT on the 13th, and a drying wind, it was beginning to feel drier underfoot this morning. Walking on grass was not the soggy experience of the last week and even fallen leaves in the wood looked drier. It was a sunny afternoon, which ended with a golden sunset. Ronaldsway (Isle of Man) recorded 7.1 h sunshine, the highest in the UK in the 24-h to 1800 GMT. Under the clear sky the temperature fell rapidly soon giving a heavy dew followed by a ground frost (-3.0C), but it became cloudy around 2230 GMT leading to a temperature rise. [Rain 0.0 mm; Max 6.1C; Min 2.5C; Grass 0.8C]
16th: It had been cold overnight with the minimum down to 0.1C. This was to be the lowest of the month. On the grass the minimum was -3.0C, the lowest of the month. The day was overcast as cloud within the high-pressure area (1043 mb) remained all day. There were periods of slight drizzle and the visibility was very poor with little or no wind. [Rain 0.5 mm; Max 6.5C; Min 0.1C; Grass -3.0C]
17th: There was a hint of some breaks in the cloud first thing in the morning but it soon thickened again giving another overcast day and no sunshine. It was very dull with a fine drizzle at times, anticyclonic gloom! [0.3 mm; Max 7.6C; Min 3.5C; Grass 1.7C]
18th: It was very gloomy at dawn with a moderate fog and continuous fine drizzle. There was no improvement in the afternoon with visibility remaining poor with a very light N-NE'ly wind. [Rain 0.4 mm; Max 7.0C; Min 5.2C; Grass 2.0C]
19th: Clearer today, the good visibility and higher cloud base gave views of the mountain summits. There was still snow lying above 3000 ft with extensive patches on the north-facing slopes of Ysgolion Duon. The thinner cloud gave a bit brighter day with little or no wind. A very red sun appeared below the cloud sheet near sunset. [Rain tr; Max 6.9C; Min 4.7C; Grass 4.2C]
20th: A very dark morning with very fine drizzle at 0900 GMT. The temperature was at its lowest (3.7C) for the past 24-h. Drizzle or light rain continued in the afternoon. The sky cleared by 2200 GMT, the moon (nearly full) was very bright. An eclipse of the moon occurred about 0445-0500 GMT but it was foggy and all I could see was an eerie orange glow in the sky. [Rain 0.9 mm; Max 6.0C; Min 3.7C; Grass 3.3C]
21st: The overnight fog had cleared and there had been a slight ground frost (-0.3C). There was slight drizzle and rain in the morning and further drizzle in the afternoon. The sky cleared somewhat in the evening giving a clear view of the full moon. The was a shower of rain overnight. [Rain 2.1 mm; Max 6.0C; Min 2.7C; Grass -0.3C]
22nd: There was ragged and broken cloud first thing and a squally shower just after 0900 GMT. This made a roaring noise in the trees for several minutes (force 6-7). There were further squally showers in the morning before becoming bright with sunny spells by noon. The afternoon was sunny but the wind had increased (NNE force 5). Cloud remained over the mountain summits. There was still a lot of snow patches to be seen giving about a 50% cover on some northern slopes. [Rain 1.3 mm; Max 7.3C; Min 4.0C; Grass 0.7C]
23rd: There had been an undulating temperature pattern overnight, 2 warm with max about 4.3C and 3 cold mins about 2.1C. The observations at 0900GMT were just out of the last of the cold periods. Alternating clear and cloudy periods probably caused these. The day remained clear and sunny with only a light N-NE'ly breeze. [Rain 0.6mm; Max 6.0C; Min 2.1C; Grass -1.0C]
24th: With the high pressure (1026 mb) still dominating the weather the cloud and drizzle had returned today. A little brighter by 1400 GMT. Little or no wind, very variable throughout the day, and almost no sunshine until near sunset when there was a spectacular sunset at 1645 GMT. There were snow showers over the mountains giving a slight covering on the peaks. [Rain tr; Max 6.0C; Min 1.1; Grass 0.6C]
25th: Huge high-pressure area dominating the UK and Europe (1029mb). A bright morning with a narrow band of clouds stretching along the length of the Snowdonia range as seen from here. Spectacular broad crepuscular rays seen as the sun was just rising above the cloud band at 0915 GMT. Fresh snow had fallen on the mountains. The morning and afternoon was quite sunny and, with little or no wind, was very pleasant out of doors. The maximum was 8.7C but at Red Wharf Bay 9.3C was recorded, the highest known in the UK on the day. Relative humidity was 74%, one of the 2 occasions of the month. Following a good sunset, with the sky partly clear, the temperature fell to a minimum of 0.5C and there was a ground frost (-2.4C). By 1900 GMT it had become cloudier and the temperature rose again. [Rain 0.0 mm; Max 8.7C; Min 0.5C; Grass -2.4C]
26th: The morning seemed bright at first, with broken high cloud overhead, but it soon was cloudier. By afternoon the clouds had darkened but there was no rain. A break in the clouds occurred from the W later and brought sunshine for a while. It became misty across the fields before dusk. [Rain 0.0 mm; Max 5.8C; Min 1.5C; Grass -2.0C]
27th: The thermograph trace showed recent undulating temperatures as patchy cloud passed over. At 0900 GMT there was altocumulus overhead 5 oktas and it had been clearing in the last hour. The morning was bright with some sunny spells but the afternoon was cloudier. At 1800 GMT the barometer was falling (1025 mb) and it had become windier. [Rain 1.0 mm; Max 7.3C; Min 1.3C; Grass -2.0C]
28th: The morning brought rain in a SW'ly force 6. Pressure was reading 1011 mb as a low S of Iceland was deepening and tracking E. During the morning the wind reached gale force and the Britannia Bridge was closed to high-sided vehicles. Some ferryboats from Holyhead were cancelled. Two bands of slight-moderate rain associated with warms fronts passed over during the day accumulating 8.6 mm. The temperature rose through the night, the maximum occurring at 0900 GMT on the 29th. [Rain 8.6 mm; Max 9.6C; Min 3.0C; Grass 0.8C]
29th: Pressure was steady at 994 mb at 0900 GMT and it was still windy, W'ly force 6. Although the wind moderated during the day ferries were again cancelled or delayed. Pressure began to rise slowly during the morning and was 996 mb at 1300 GMT, the maximum had reached 10.1C. In the afternoon there was at first drizzle then a band of rain from 03 GMT accumulated 4.2 mm by morning.[Rain 4.2 mm; Max 10.1C; Min 5.5C; Grass 4.8C]
30th: Another dull but mild morning. The temperature was 9.0C having varied little from noon yesterday. It was breezy in the SW'ly wind with slight drizzle around noon. In the afternoon it became windier, SW'ly force 6-7. A small temperature range during the day, 9.0C at 0900 GMT to the max of 10.1C and falling to 8.5C overnight produced a very flat looking thermograph trace. [Rain 0.8 mm; Max 10.1C; Min 7.1C; Grass 5.0C]
31st: Very dull from dawn and misty too. The overnight minimum was 8.5C, the highest of the month. By 1045 GMT fog had developed but visibility had improved to very poor by 1300 GMT. Slight drizzle at times in the afternoon and again became windier later SW'ly force 5-6. Another very flat thermograph trace, 8.5C-9.1C-9.5C-8.3C. [Rain 1.0 mm; Max 9.5C; Min 8.5C; Grass 8.1C]
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1st: It continued quite windy but dry throughout the night. Several rumbles of thunder were heard at 0318 GMT. The temperature at 09 GMT was 8.3C, the 24-h minimum and the highest of the month. It started to rain at 07 GMT and continued until 16 GMT accumulating 9.3 mm by 1800 GMT when it was misty. The road to Llanbedrgoch was flooded again. It was mild with a maximum of 9.2C. [Rain 9.5 mm; Max 9.2C; Min 8.3C; Grass 7.6C]
2nd: The sky was clearing to give a sunny morning. The wind had decreased and there had been a ground frost (-1.2C), frozen water deposits were melting on grass and plants in the garden. There was cloud over the mountains and it remained there all day, this obscured any view of the summits. It became cloudier by 1300 GMT but this cleared again to give a sunny afternoon and a clear evening. Some bluebell leaves have appeared in the wood, some are about 4 cm tall. [Rain 0.0 mm; Max 9.4C; Min 2.2C; Grass -1.2C]
3rd: It was bright at first but was soon cloudier and it began to rain later. The rain continued in the afternoon but there was a bright spell and a glimmer of sunshine later. At 17 GMT there was drizzle followed by slight rain through till morning. The temperature had risen throughout the day, the minimum was at 09 GMT and the maximum 9.3C from 03-08 GMT on the 4th. [Rain 12.6mm; Max 9.3; Min 3.7; Grass 0.3C]
4th: It was moderately foggy with low cloud at dawn. Fine drizzle was being blown along in the SSW'ly force 6 wind. A pool of water had appeared in the old 'cricket' field next to the house. The ground is still saturated and any rain is enough to flood fields cause runoff on to the roads. Intermittent slight drizzle during the day with the wind remaining a S-SW'ly force 6. Visibility poor or very poor. Amounts of rainfall were small but when it dried significant deposits of a yellow-orange dust was found on top of the screen, edge of greenhouse glass, a garden table and the outlets of the raingauge funnels. This looked similar to the Saharan-type dust seen previously. The dust was also reported from Lisburn, Co. Antrim; Brampton, NE Cumbria; Wigan and Leeds. The synoptic chart indicates a S-SW'ly flow of air from N. Africa and suggests its likely origin. [Rain 0.4 mm; Max 9.5C; Min 5.9C; Grass 4.5C.
5th: Deposits of dried-out yellow-orange dust deposited yesterday still evident. The cloud was higher over the mountains this morning and there was a spectacularly vivid red sky at 0737 GMT. Could the dust in the atmosphere have enhanced the red sky? Volcanic dust and some pollutants can do this. The morning remained cloudy and the SSW'ly force 5-6 persisted. Later there was intermittent drizzle. There was some light rain in the evening and it became less windy. It remained mild. [Rain 3.4 mm; Max 9.4C; Min 8.0C; Grass 7.3]
6th: Light rain had just started at 0900 GMT but became intermittent. The S'ly force 4 increased during the morning and was force 7 at 1300 GMT. The afternoon was blustery with slight rain on the wind. Gale warnings were in operation for northern Britain and Irish Sea fast ferries were already being cancelled. Pressure fell to 1002 mb before starting to rise again in the evening. Gusts of over 70 mph were reported from stations N of here. The sky had cleared by 22 GMT when the barometer was reading 1009 mb. [Rain 6.7 mm; Max 10.0C; Min 7.7C; Grass 6.8C] 
7th: It was again very windy with the SSW'ly at force 6-7 and with moderate rain made the 0900 GMT observations interesting! The rain eased but it continued blustery with strong gusts during the morning. After the rain it became bright and quite sunny for a while and the maximum temperature reached 10.5C. Colwyn Bay recorded 3.9 h of sunshine the most in the UK. but I do not think we had as much here (Valley recorded 1.9 h). There was a blustery shower at 1615 GMT then it was dry until 05 GMT when there was 3 h of light rain. [Rain 4.1; Max 10.5C; Min 4.7C; Grass 2.2C]
8th: A slight shower at 0900 GMT then it soon brightened. There was a sudden squally shower at 1135 GMT, the wind blew over dustbins and garden paraphernalia here and in Llandegfan. At Llanbedrgoch there was a 10-min hail shower (at least 5-mm according to the Postmaster) which covered the ground. There were further showers at Pentraeth and here about 1340 GMT (snow pellets and a few flakes of snow) and at Pentraeth only at 1430 GMT some ice pellets. There was a temperature drop of at least 4.5C during this episode. Spherics were recorded in the area and thunder was heard at Pentraeth. A thin covering of snow was deposited on the mountain summits during the afternoon. About 2130 GMT there was a slight shower of ice pellets at this station. In between the showers it had been quite a sunny day with Valley recording 5.4 h and Colwyn Bay 4.5 h. The Isle of Man was the UK highest with 6.8 h, all to 1800 GMT. [Rain 0.3; Max 9.7C; Min 6.1C; Grass 5.5]
9th: There was a slightly pink sky at dawn and the morning remained largely cloudy with one or two bright and sunny spells. The wind was a gusty force 5-6 SW'ly which increase towards evening. At 2100 GMT pressure was 1010 mb and it was blowing a gale (force 8) with strong gusts (Valley was reporting gusts of 54 mph) which were throwing around a lot of tree debris. The gale continued until well after midnight and eventually became more S'ly. Valley was reporting gusts of 60 mph and pressure dropped to 997 mb at 05 GMT. A 4-h band or rain from 0230 GMT deposited 14.7 mm by morning. [Rain 14.7 mm; Max 9.6C; Min 3.5C; Grass 1.0C]
10th: Since 06 GMT the temperature had fallen 4C to 3.4C as the cold front had passed. The wind had veered to the WNW by 0900 GMT. There was a chink of blue sky visible to the N-NW and this soon spread over to give a largely sunny day. Relative humidity fell to 59%, one of the two occasions during the month. A covering of fresh snow had fallen on the mountains and was lying as low as 1500 ft in the Nant Ffrancon pass at Ogwen Cottage. At 1300 GMT cloud was hanging over the snow-covered Carnedd Llywelyn and Ysgolion Duon. The barometer was rising through the day and had reached 1018 mb at 1800 GMT. The sky was still relatively clear with a band of decaying cumulus clouds on the western horizon and over the mountains. It was a quiet night and no rain in the 24-h period. [ Rain 0.0; Max 7.7C; Min 9.6C; Grass 2.9C]
11th: The day soon became sunny, visibility was good although it was very hazy. A thin covering of snow could be seen lying on the mountains above 2000 ft. After dark it became increasingly windy, the SSW'ly was strong to gale most of the evening and became stronger after midnight. Valley was reporting a mws of 44 mph and gusts of 55 mph. Two short bands of rain from 02 GMT resulted in 14.7 mm accumulated over only 2.8 h. This was exactly the same 24-h amount as recorded on the 9th, but was of shorter duration. [Rain 14.7mm; Max 9.6C; Min 3.0C; Grass -1.0]
12th: Ice pellets had fallen in the night after midnight. The morning was bright with sunny intervals. Cloud was high over the mountains and a thin covering of fresh snow had fallen on the summits and down to 1700 ft in places. The temperature had reached the maximum for the day (6.6C) just before noon. The afternoon, bright at first, became showery with ice pellets at 1600 GMT and sleet later before the sky cleared later in the night. [Rain 3.0 mm; Max 6.6C; Min 3.0C; Grass 0.5C]
13th: An almost clear sky brought a sunny day. It was cold at first with an overnight ground frost (-2.2C) and some thin ice formed on a bird water trough. It was calm but a light NNW'ly breeze set in later. Valley reported 8.6 h sunshine, the highest along the North Wales coast but was exceeded by Scarborough (N. Yorkshire) with 9.0 h. A clear sky in the evening led to an early ground frost (-2.5C). [Rain 2.4 mm; Max 9.1C; Min 0.6C; Grass -2.2C]
14th: There was intermittent slight rain at first. The S'ly wind soon veered SW'ly and there was driving drizzle and poor visibility for a while. It began to clear from the NW at 1230 GMT when it became sunny. Bt 1300 GMT the temperature had risen to 12.2C and was to soon reach 12.8C, the highest of the month, before the mist and rain returned later in the afternoon. [Rain 5.2C; Max 12.8C; Min 1.2C; Grass -2.5C]
15th: There had been a touch of ground frost overnight (-0.5C). The morning was cloudy with a light SW'ly wind. Band of moderate rain from 14 GMT lasting 4.1 h. Rate of fall remarkably constant at 1.8 mm per h. The evening was cloudy but the cloud was thin and at 2000 GMT a double halo around the moon was seen. The moon almost full and very bright at present as its orbit is nearest the earth for many years. The inner ring probably 22deg and the outer possibly 46deg showed slight coloration. [Rain 7.3; Max 6.9; Min 2.7C; Grass -0.5C]
16th: Another ground frost and in good visibility fresh snow could be seen on the mountains down to 2000 ft. The was a slight shower of rain in the morning which was dull. The afternoon was brighter with sunny intervals at first but became cloudier by 1600 GMT. The maximum for the day was 5.5C, the lowest of the month. Later the sky cleared. [Rain 0.0 mm; Max 5.5C; Min 0.8C; Grass -1.9C]
17th: There was slight hoarfrost at first but it soon melted. The morning was sunny but it became cloudier in the afternoon with rain from 16 GMT, which turned showery in the night. [Rain 7.1 mm; Max 8.8C; Min 0.4C; Grass -3.4C]
18th: The morning was showery, the afternoon was drier and brighter with a little sunshine. The barometer reached a low of 999 mb during the day. The evening and night was partly cloudy with a shower of rain (1 mm) around 03 GMT. [ Rain 1.7 mm; Max 8.5C; Min 0.9C; Grass -1.7C]
19th: The sky was clear overhead but there was a bank of clouds hovering over the mountains. Visibility moderate at first soon became very good with clear views of the Lleyn Peninsular. Thin snow could be seen on Snowdon and the Carneddau Mountains down to 2800 ft. The was a spectacular sky after a cloudless sunset. Grading from blue above through gold then orange. [Rain 0.0mm; Max 7.4C; Min 3.6C; Grass 1.9C]
20th: There had been a slight air frost (0.4C), rare this winter and the only one in the month. A moderate ground frost (-4.6C) was the lowest recorded in the month. This produced moderately thick ice on the bird water troughs. There was a lot of cirrus clouds overhead at 0900 GMT, it became cloudier but the morning remained bright. The sun could be seen through the clouds most of the day. There was some cumulus cloud development to the S over the mountains. It was windier later with a period of rain from 22 GMT of 3.5-h duration. [Rain 4.2mm; Max 8.4C; Min -0.4C; Grass -4.6C]
21st: It was a sunny day with a light W-NW'ly breeze. The maximum rose to 10.2C and the relative humidity fell to 59% for the second time in the month. There was a very golden sunset lighting lenticular altocumulus clouds in the west. Valley reported 8.5 h sunshine but this was exceeded by the Isle of Man (8.6h) and Prestatyn 9.2h (the UK highest). [Rain 0.0mm; Max 10.2C; Min 1.6C; Grass -1.5C]
22nd: It was almost overcast but the cloud was high and all the mountain summits were clearly visible for once. A little snow could be seen on the summits of Snowdon and Crib Goch, Y Garn and the Glyders around Cwm Idwal, and the Carneddau. The summits of Dafydd, Llywelyn and Foel Fras were illuminated by a band of crepuscular rays. During the afternoon the cloud was a little lower over the summits. In Llansadwrn there were a few spots of rain. Many autumn sown fields of cereals in the area have wet patches in which the plants have not germinated or have died. [Rain tr; Max 8.4C; Min 0.5C; Grass -3.5C]
23rd: Slight rain at times and poor visibility in the morning. The afternoon was no better with drizzle and periods of rain from 21 GMT. [Rain 2.9mm; Max 10.0C; Min 4.3C; Grass 3.7C]
24th; Some signs of clearing first thing but it was soon duller. The cloud was high and thin with the sun shining weakly through at times. It was very hazy. Rain and some ice pellets in the evening. [Rain 2.5mm; Max 7.6C; Min 3.5C; Grass 0.0C]
25th: There had been a ground frost overnight with a slight glaze of ice on the concrete paths. A sunny day, it was very hazy and visibility was moderate improving to good later in the afternoon. The sky was still clear at 22 GMT but it became cloudy later in the night with showers of rain from 05 GMT; [Rain 1.1mm; Max 9.5C; Min 0.5C; Grass -3.9C]
26th: Another sunny start to the day the showers having cleared away. During the afternoon it became cloudier and the SW'ly wind soon increased to force 6-7. It was to blow a gale before midnight, Valley reporting mws of 40 mph and gusts of 52 mph. A period of rain from 18-19 GMT and moderate rain from 05 GMT. [Rain 5.4 mm; Max 9.8C; Min 3.8C; Grass 1.0C]
27th: The gale continued after midnight with Valley reporting mws of 44 mph and gusts of 54 mph. It was still raining with gale force wind at 09 GMT. The wind moderated but the rain continued until 17 GMT. The old cricket field opposite the house had large pools of water on it all day. There was some more rain in the night and this brought the 24-h total to 25.4 mm, the largest of the month. [Rain 25.4 mm; Max 9.7C; Min 5.2C; Grass 3.7C]
28th: There had been a slight fall of ice pellets after midnight. The morning was bright clearing to give sunny spells during the morning. Fresh snow had fallen on the mountains down to 2000 ft and near the road at Ogwen Cottage. The afternoon was sunny but became cloudier later. [ Rain 7.0mm; Max 7.8C; Min 4.1C; Grass 1.9C]
29th: There was a period of rain from 01-08 GMT, which accumulated 7.0 mm. As the rain ceased it became moderately foggy for a while but was clearing by 0900 GMT. It remained cloudy and there was a shower of rain at noon. The afternoon was sunnier for a time then there was another shower. By 22 GMT the sky was clear and there was to be a slight ground frost (-0.1C). [Rain 1.8mm; Max 8.0C; Min 4.8C; Grass 3.0C]
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1st: A clear sky overnight with little of no wind resulted in only a touch of ground frost (-0.1C). The morning was bright with sunny intervals but there was a slight shower of rain. At 1300 GMT there were quite active looking cumulus clouds to the S and W. A thin sprinkling of fresh snow could be seen on the mountains down to 2750 ft adding to patches remaining from previous falls. At 1455 GMT there was a moderate shower of ice pellets followed by sleet which fell as snow on the mountains as low as 1000 ft. Further shower of ice pellets at 1635 GMT. The day's maximum was 8.2C one of the two lowest of the month. At 2200 GMT the sky had cleared and there was a ground frost before cloud and rain from the NW. [Rain 7.4 mm; Max 8.2C; Min 2.5C; Grass -0.1C]
2nd: Continuous moderate rain at first and becoming windier. Heavier spells of rain around noon shown on the new rainfall radar pictures available online from the BBC weather pages. Wind SW'ly force 6-7 during the afternoon and very poor visibility at times. Rainfall at Capel Curig to 18 GMT was 43 mm, the largest fall reported in the UK. There was further moderate rain in the night bringing the 24-h fall here to 15.8 mm over 9.3-h duration, the largest fall of the month. As the soil is still saturated runoff from the fields resulted in flooded roads, especially at Llanbedrgoch near the Post Office. The 'cricket' field opposite the house again had large pools of water on it throughout the day. [Rain 15.8 mm; Max 9.2C; Min 1.8C; Grass -1.7]
3rd: There had been a touch of ground frost (-1.0C) as the sky cleared following the rain. The sky was clear overhead but a bank of clouds and mist was obscuring the mountains. It became cloudier by 11 GMT but remained dry. The maximum of the day was 8.2C and along with that on the 1st being the lowest of the month. Slight deposits of dust were seen when surfaces had dried. These looked similar in colour to that deposited on 4th February and thought to be of Saharan origin. The possibility of it being from the Icelandic volcano Hekla remains, but unlikely owing to its colour. The afternoon was sunny and when the cloud had cleared away from the mountains snow could be seen around 3000 ft on the summits of Snowdon and the Carneddau. It became cloudier towards dusk, with moderate sunset colours, and there was a shower of rain and ice pellets at 1845 GMT. [Rain 0.6 mm; Max 8.2C; Min 2.5C; Grass -1.0C]
4th: A calm morning with weak sunshine. Smoke could be seen in the Menai Strait. There had been an overnight frost (-1.6C, the lowest and only of the month) and a moderate ground frost (-5.8C, the lowest in March since 1995) with hoarfrost deposits on the grass and vegetation. There had also been a slight fall of small (1-2 mm) snow pellets. It was soon sunny, cumulus clouds began to develop as the temperature rose to 9.5C and the relative humidity fell to 57%, the lowest of the month. The afternoon remained sunny in the light N-NW'ly breeze. It was partly cloudy by 2200 GMT.[Rain 0.0 mm; Max 9.5C; Min -1.6C; Grass -5.8C]
5th: A sunny start to the day, a ground frost (-3.5C) but the air temperature kept just above freezing (0.3C). It became windy, SW'ly force 5 and this helped to dry the ground a little more. Leaves on the ground in the wood were also drying and blowing around. Cumulus clouds were scudding by. Moderate snow could be seen at 3000 ft especially on the flatter tops of the Carneddau, and Snowdon. Slight snow also down to 2800 ft in places. The afternoon, sunny at first, turned cloudy by 1500 GMT. It remained windy, SW'ly force 5-6, and there was drizzle by 2200 GMT. [Rain 0.4 mm; Max 9.1C; Min 0.3C; Grass -3.5C]
6th: A dull morning and it soon became moderately foggy. This was to clear later and it became sunny by noon reaching 10.7C by 1300 GMT and soon reaching 11.7C. It was not to last and mist rolled in again in the afternoon from time to time and there were spots of rain at 1615 GMT. [Rain 5.7 mm; Max 11.7C; Min 4.6C; Grass 3.9C]
7th: A band of rain from 04-06 GMT amounting to 5.7 mm. Fog and low stratus cloud with occasional drizzle followed. A miserable day. [Rain 0.4 mm; Max 10.3C; Min 8.0C; Grass 7.7C]
8th: Moderate fog at first but improved to poor visibility later in the morning. The afternoon was dull and damp with fine spots of drizzle on the wind (SW'ly force 4). The leaves of hawthorn and the white flowers of blackthorn are appearing in the hedgerows. [Rain 0.4 mm; Max 11.6C; Min 8.5C; Grass 8.3C]
9th: With the wind in the W the murky weather showed signs of clearing. It became brighter during the morning but the mountains remained obscures in cloud and mist. The afternoon was bright at first but there was a period of light rain from 16-19 GMT accumulating 4.0 mm. The minimum of 8.8C was the highest of the month. [Rain 4.0 mm; Max 12.9C; Min 8.8C; Grass 6.4C]
10th: Back to the murky weather with cloud hanging low over the mountains. Fine drizzle for a while in the morning with visibility moderate to poor. Another day without any sunshine. Further drizzle at 2100 GMT but an unmeasurable amount, the bottle being dry next morning, but contained traces of dust. There had been a further slight deposition of dust, which looked 'plaster pink' in colour suggesting it was of Saharan origin. [Rain tr; Max 9.6C; Min 7.8C; Grass 7.3C]
11th: A brighter morning with signs of clearing at 09 GMT. There were some sunny spells, especially in the afternoon, and it felt warm as there was little or no wind. It was cloudier before dusk but cleared again by 2200 GMT. [Rain nil; Max 11.5C; Min 7.0C; Grass 6.1C]
12th: A slight ground frost overnight (-0.9C]. By 09 GMT any frozen water deposits had melted. Deposition of water on the grass had been heavy. Although there were signs of the cloud thinning the morning remained overcast. During the afternoon it was brighter with even a few sunny spells. Again little or no wind so it felt pleasant out of doors although the maximum reached only 9.8C. It became cloudier later and there was a short spell of drizzle around 1930 GMT. Deposition of dust had been reported in N. Ireland during the afternoon but none was seen here. [Rain tr; Max 9.8C; Min 3.8C; Grass -0.9C]
13th: A cloudy start to the day. Visibility was poor it being very hazy. From time to time it appeared brighter. By 1300 GMT the temperature had reached 13.6C and this was the maximum for the day and the highest of the month. It was soon cloudier and there were a few spots of rain by 1500 GMT and 0.5 h light rain from 1600 GMT.A deposit of dust occurred, visible on dried surfaces the next morning, light orange in colour suggesting it was again of Saharan origin. [Rain 0.5 mm; Max 13.6C; Min 7.7C; Grass 5.8C]
14th: It was beginning to clear and the morning was bright with thin cloud cover. Visibility was good but it was hazy. Cloud remained on the summits of the Snowdonia Mountains. The cloud was thick enough later in the afternoon to deposit a little rain but the raingauge bottle was dry on the following morning. [Rain tr; Max 10.2C; Min 6.7C; Grass 6.0C]
15th: An intensifying area of high pressure (1036 mb) was settled over the UK. Unfortunately there was a lot of cloud around and the day remained cloudy. The temperature did not vary a lot during the next 24-h and there was no rain. [Rain 0.0 mm; Max 8.9C; Min 2.6C; Grass -0.3C]
16th: Overcast and calm. In the garden the ground was drier and leaves in the wood were also dry on the surface. It remained dull except for 1 or 2 small breaks in the afternoon, these soon closed over again. There was some drizzle around 2200 GMT. [Rain tr; Max 10.6C; Min 6.5C; Grass 6.3C]
17th: Again overcast and very dull. The gloom continued with slight drizzle around noon. Another deposit of dust, of likely Saharan origin, probably about the time of the drizzle. When wet the dust looks light orange in colour, but when collected on filter paper and dry looks like unpainted 'pink wall plaster'.
It remained cloudy and dull into the evening. A period of rain from 03 GMT for 3.9h deposited 3.3 mm.[Rain 3.3 mm; Max 10.2C; Min 7.1C; Grass 6.5C]
18th: The mist and cloud was clearing slowly in the morning. By 1000 GMT the temperature had risen to 12.2C and this went on to reach 13.1C. The afternoon was quite sunny and the cloud gradually cleared the summits of the Carneddau Mountains but not of Snowdon. The mountains had been largely obscured for the past 12 days. The sky was clear at 2200 GMT and this led to a slight ground frost (-1.0C). [Rain 0.0 mm; Max 13.1C; Min 7.4C; Grass 6.4C]
19th: Cloudy again by morning, the sun did show through rather thick cloud around 0900 GMT but it did not begin to clear until 1600 GMT. After dark the sky was clear and low lying fog developed for a few hours. This had cleared by 2000 GMT before clouding over again. There was heavy dew but the grass minimum did not drop below 0.2C. [Rain 0.0 mm; Max 10.8C; Min 3.5C; Grass -1.0C]
20th: Another dull morning with 8 oktas cloud cover. There was a layer of smoke haze in the Menai Strait but the mountaintops were visible in clearer air above about 2500 ft. The day remained dull with little or no wind. [Rain 0.0 mm; Max 9.6; Min 3.6C; Grass 0.2C]
21st: At first there were one or two breaks in the cloud, these soon disappeared and it was another dull overcast but dry day. [Rain 0.0 mm; Max 10.5C; Min 4.7C; Grass 1.6C]
22nd: Sunny today, the first for 10 days! Visibility was poor because of haze and there was very heavy dew on the grass. It remained cool as there was a NE'ly breeze off the sea but in Llandegfan on the south facing slope of the Menai Strait it felt quite warm. Anglesey turned out to be the sunniest in the UK with 9.5h. The first chiff-chaff of the season has arrived, 5 days earlier than last year, and was singing strongly in a willow tree in the garden. [Rain 0.1 mm; Max 10.1C; Min 2.6C; Grass 0.1C]
23rd: A slight shower at 0630 GMT was to set the pattern for the day. A deposition of Saharan dust was seen during the afternoon following the showers of rain and before a prolonged shower in the afternoon. There were further showers and slight rain from 06 GMT the next morning. [Rain 4.1 mm; Max 11.2C; Min 4.4C; Grass 2.0C]
24th: Following the showers and slight rain earlier there were signs of a clearance. The morning remained showery but the afternoon and evening was sunny. Anglesey had 8.3h sunshine but this was exceeded by Falmouth with 8.8h. With the spell of drier weather ploughing of nearby fields was well underway. Work in gardens was also being started now that the ground can be worked once again. [Rain 2.9mm; Max 11.1C; Min 6.6C; Grass 3.4C]
25th: A sunny start to the day and this was to continue all day. A thin covering of snow had fallen on the mountains of Snowdonia during the night and was lying as low as 2500 ft in places. Some well-developed cumulus clouds were seen to the south during the afternoon but it did not rain here. The sky was clear at 2200 GMT and there was a slight ground frost (-0.3C). Rain 1.4 mm; Max 10.5C; Min 3.3C; Grass 1.7C]
26th: A dull start to the day and there was to be slight rain before noon. In the afternoon the sky cleared and the rest of the day was sunny. [Rain 2.5mm; Max 9.6C; Min 3.3C; Grass -0.3C]
27th: Another sunny start to the day. There was heavy dew on the grass but the grass minimum had only dropped to 2.0C. Anglesey was clear but there were clouds to the NE and cumulus over the mountains with crepuscular rays in the Nant Ffrancon Pass. The day remained sunny but there was cool NE'ly wind. Anglesey was the sunniest reported with 11.4h. The first bluebell flower has appeared in the wood, much earlier than last year. [ Rain 0.0; Max 9.3C; Min 4.3C; Grass 2.0]
28th: Bright at first but soon cloudier. There was a cold NE'ly wind and by noon the temperature was only 6.7C. The afternoon remained cloudy but began to clear towards evening. At 2100 GMT the sky was clear, with bright stars, leading to a slight ground frost (-0.6C). It became cloudier before morning. [Rain 0.0; Max 8.4C; Min 3.4C; Grass 1.1C]
29th: Cloudy at first but becoming sunny by mid morning. The afternoon was sunny and it became less windy towards dusk. A clear sky at night led to a ground frost (-2.7C) by next morning.[Rain 0.0; Max 10.1C; Min 2.0C; Grass -0.6C]
30th: There was hoarfrost on the ground early but this soon disappeared in the sunshine. Small cumulus clouds developed around 0900 GMT and lasted for about 10 mins then disappeared. Some cloud was also spilling over the mountaintops at first. The rest of the day was sunny and cloudless. It was hazy and there was a cool breeze keeping the maximum down to 8.9C. The night was clear the minimum falling to 0.0C and to -3.7C on the grass. [Rain 0.0; Max 8.9C; Min 0.5C; Grass -2.7C]
31st: There was moderate hoarfrost making the grass in the fields look white. By 0900 GMT it was becoming cloudier with some cumulus to the S and cirrus and cirrostratus overhead. With several days of dry weather the ground has been drying out and the surface was dry for the first time. Pressure was declining as a low near Iceland was drifting towards NW Scotland. It remained bright until mid afternoon when it became murky and there were some fine spots of drizzle about 1900 GMT. A band of rain from before midnight resulted in 4.8 mm by morning.[Rain 4.8 mm; Max 10.0C. Min 0.0C; Grass -3.7C]
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1st: A dismal start to the day, poor visibility and slight rain that stopped just before 0900 GMT. The day remained overcast with little or no wind. There was further rain in the afternoon and about 2100 GMT, which also included some ice pellets. [Rain 2.7 mm; Max 9.1C; Min 4.6C; Grass 3.7C]
2nd: Early low lying inversion fog was clearing before 0900 GMT but remained in the Menai Strait and around some headlands. The mountaintops were clearly visible above the fog. During the day there were spells of drizzle or light rain that turned to moderate rain from 1800 GMT. From 1500 GMT the temperature fell slowly from near the maximum (9.2C) to 1.8C at 0900 GMT on the 3rd. The rainfall of 13.1 mm over 15.8-h duration was the most in the month. [Rain 13.1 mm; Max 9.2C; Min 4.6C; Grass 0.5C]
3rd: Continuous slight rain with intermittent sleet or snow from 0630 GMT. There were large pools of water again on the old cricket field opposite the house. The recent drier weather not having reduced the soil water content by very much. Strong NE'ly wind led to disruption of Irish Sea ferry crossings to Ireland. The HS ferries were cancelled and conventional craft were delayed. The Britannia Bridge was closed to high-sided vehicles. Rain here had been falling as snow above 500 ft on Snowdonia and Cheshire. There was 1 in of snow reported from Bethesda in the Nant Ffrancon Pass and the A5 at Ogwen Cottage was difficult. There was deep snow reported at Blaenau Ffestiniog. The Horseshoe pass near Llangollen became particularly hazardous and the road was closed. Worst hit was NE Wales with roads shut and homes without electricity. At Bwlchgwyn near Wrexham electricity was off all day. Sleet or snow showers continued here all day but amounts of precipitation were small. There were showers of ice pellets later in the day starting at 1840 GMT and going on until midnight. The day time temperature struggled to reached 2.4C while the 24-h maximum of 3.5C, at 09 GMT on the 4th, was the lowest maximum in April recorded at this station since records started in 1979. [Rain 0.9 mm; Max 3.5C; Min 1.8C; Grass 1.3C]
4th: A sunny start to the day but with a strong NE'ly wind. Temperature at 0900 GMT was 3.5C, the maximum for the last 24-h. The morning continued sunny but with some snow flurries later in the day. It became less windy towards evening. Clear conditions enabled good views of the snow covering the Snowdonia Mountains. The snow stretched all across from the east, where it was thickest, to the Rivals Mountains (Yr Rifl) on the Lleyn Peninsular in the west. Valley recorded 9.2h sunshine for the day. [Rain tr; Max 7.3; Min 1.5C; Grass -0.4C]
5th: An area of high pressure extending from Ireland was building across the UK. Pressure (1019 mb) was rising and it was a sunny morning and very clear air. There was frost on the ground early with the grass minimum down to -2.6C. Views across Anglesey to the mountains, still covered with snow, and to the Lleyn Peninsular were stunning. The snowline was around 800 ft: snow was thickest on the summits of Carnedd Llywelyn, Foel Fras and eastwards but thinner at lower levels. There was a sprinkling of snow still remaining on Yr Eifl on the Lleyn Peninsular. It was very sunny all day with Colwyn Bay recording the highest sunshine in the UK for the day with 11.9h, Valley 11.8h. [Rain nil; Max 9.0C; Min 1.0C; Grass -2.6C]
6th: Another sunny start to the day with an early extensive hoarfrost, the grass minimum of -3.7C was the lowest of the month. The temperature at 0900 GMT was 8.1C and there was hardly any wind. The wind remained variable from the NE, off the sea, and sometimes S-SE'ly. The lysimeter was dripping as a result of the melting of frost deposition although water had not been added since 0900 GMT on the 5th, there having been no rain. The day remained largely sunny although a little cloud built up from time to time as a result of the convergence of cool air off the sea and warmer air from the S. Relative humidity was 43% for a large part of the day, the lowest of the month. The maximum rose to 13.5C, one of the highest in the UK. Leuchars in Scotland reported 14C. The evening and night were clear leading to another ground frost (-1.6C). A display of Northern Lights (Aurora) was seen from Anglesey, and other southern parts of Britain, around 00 GMT. Alistair Read reported a 'grand display...red band with some curtain displays of white/green lights varying in intensity'.[Rain nil; Max 13.5C; Min 1.1C; Grass -3.7C]
7th: The day dawned sunny with an extensive ground frost (-1.6C). There were many cirrus clouds overhead and it was very hazy, views of the mountains and the Lleyn very blurred today. At noon the temperature was 10.9C but the afternoon became even hazier and, with thin cloud, the sun was obscured. There was a front approaching from the NW and the cloud thickened but it remained dry. [Rain nil; Max 12.1C; Min 2.2C; Grass -1.6]
8th: Bright at first but with thick haze visibility was poor. Clouds were fragmented cumulus with cirrus above. It became dull by noon and later dark and murky with a few spots of fine rain. Rain over Scotland moving south was petering out as it reached here. The wind a light SW'ly in the morning moved to the NE as brighter weather arrived later in the day. Before dusk it had become dull again. [Rain tr; Max 10.1C; Min 4.4C; Grass 2.0C]
9th: There were heavy spots of rain about 0730 GMT but these did not wet the ground completely. It made no difference to the soil, which for the third morning in succession was recorded as dry. It became bright for a time later but soon turned cloudier until later in the afternoon when it brightened. The evening and night had a hazy clear sky with a slight touch of frost on the grass by morning. [Rain nil; Max 8.9C; Min 4.5C; Grass 2.2C]
10th: A golden red sunrise over the mountains to the east just before 06 GMT set the seen for the day. A cloudless sky at 0900 GMT, the first of the year, but it was hazy with smoke in the Menai Strait obscuring the mountains. Pressure was 1020 mb. The wind was a light NE'ly but the maximum reached 11.1C before noon. The afternoon, sunny at first, became cloudier later and remained dry. The barometer had fallen to 1014 mb at 1830 GMT. A 6-h band of rain from 23 GMT accumulated 6.8 mm. [Rain 6.8 mm; Max 11.1C; Min 2.8C; Grass -0.1C]
11th: Early rain ceased about 06 GMT then there was a sign of the sky clearing but this did not last. The morning remained dull with spots of rain and a slight shower of ice pellets at 1055 GMT. In the afternoon there were further showers of rain and sleet, which fell as snow on the mountains of Snowdonia. Further showers before and after midnight of rain and ice pellets. [Rain 4.0 mm; Max 6.6C; Min 3.9C; Grass 1.7C]
12th: The day was dull with slight rain at first. It became windier later and there was further rain from 1630-1830 GMT. [Rain 1.1 mm; Max 8.5C; Min 3.0C; Grass 1.7C]
13th: At dawn it was raining slightly and the day remained very dull with intermittent slight rain. The forecast for the week had been deteriorating and hopes of a fine sunny day for Friday (when Gordon our son was being married in Conwy) were fading. The forecast for Wales was not good but my digital 'Oregon Barometer' was forecasting a sunny day! The family was disbelieving but the analysis chart was showing better weather to the north and it was likely to reach the North Wales coast by the morning. [Rain 0.9 mm; Max 5.8C; Min 4.5C; Grass 3.3C]
14th A bright start to the day, and a clearance from the North, enhanced my forecasting reputation enormously. The day was sunny with just a chance of showers over the mountains at first but this receded as the day went on. The morning and afternoon was sunny, although there was a cool NE'ly breeze. Snow was lying down to about 2000 ft in places on the Snowdonia Mountains. Valley (Anglesey) reported 7.6 h sunshine and Ronaldsway (Isle of Man) 9.8 h, the highest in the UK for the day. [Rain nil; Max 8.5C; Min 3.7C; Grass 2.2C]
15th: A bright start to the day with frost on the ground early. With some good sunny spells, and very light wind, the temperature reached 10.3C, with a relative humidity of 47%, about 1130 GMT. Some cumulus clouds were bubbling up however and it became cloudier after noon. At noon the temperature had dropped to 7.7C and soon to 4.3C. There was a slight shower of snow pellets, and then further snow pellets and some snow flakes intermittent for about 1 h from 1305 GMT. The afternoon was dull at first with further intermittent slight rain. Later it was brighter and the sky cleared before nightfall. [Rain 0.3 mm; Max 10.3C; Min 0.6C; Grass -3.3C]
16th: Another bright start to the day, an overnight ground frost (-2.6C) had melted by 0900 GMT. The minimum of 0.5C was the lowest of the month. There was a change of wind direction, the N-NE'lies of the past 7 mornings had given way to a S'ly. The temperature at 0900 GMT was 8.8C, the warmest of the month so far. It was soon cloudier with very slight showers. This was to be the pattern of the day with further spots of rain with only a few bright spells, but the temperature kept around 10C (max 11.1C) until 19 GMT. There was a band of rain from about 03 GMT that accumulated 8.0 mm by morning. [Rain 8.0 mm; Max 11.1C; Min 0.5C; Grass -2.6C]
17th: A wet start to the day with moderate rain. This had eased by 1100 GMT but there was intermittent drizzle later. At noon the temperature was only 5.1C, with slight drizzle, and it was only to rise to 5.6C during the day. The lowest since the 3rd, and April 1992. Further rain in the afternoon, about 1 mm by 1700 GMT. The temperature at 0900 GMT the next morning was 6.5C, having just started to rise, this was the 24-h maximum for the 17th. [Rain 5.8 mm; Max 6.5C; Min 3.2; Grass 2.8C].
18th: A band of rain from 04-06 GMT had cleared away and it was becoming bright with some sunshine. This had fallen as snow on the mountains down to 2000 ft. During the morning at times it was cloudier with slight showers of rain. By noon the temperature had reached 10.7C and the afternoon was sunny with a maximum of 11.4C. The light SSW'ly wind backed to the NE later and at dusk the sky was clearing leading to a slight ground frost (-0.7C). [ Rain tr; Max 11.4C; Min 3.8C; Grass 1.4C]
19th: At 0130 GMT there was low lying fog across the fields but this had cleared by dawn. The morning was sunny and warm in a light S'ly breeze. By noon the temperature had reached 13.6C, this was to rise to 14.0C with a relative humidity of 45% just before frontal cloud moved across. There were some heavy spots of rain at 1500 GMT and further showers in the night. [Rain 0.7 mm; Max 14.0C; Min 3.1C; Grass -0.7C]
20th: Bright at dawn but there were cumulus clouds building aver the mountains. By 0900 GMT there was a shower of rain in progress and the day continued showery. The minimum of 9.4C was the highest of the month. The afternoon was windy with the S'ly increasing to force 6-7 at times. There was a shower with ice pellets at 1419 GMT. It was quite sunny with Valley reporting 9.0 h sunshine, the highest reported in the UK for the day to 18 GMT. [Rain 2.5 mm; Max 13.9C; Min 9.4C; Grass 7.8C]
21st: The morning was showery with bright and sunny spells. Showers were to be the pattern for the day, but amounts of precipitation were small. There was a longer spell of rain in the night that contributed most to the 24-h total of 4.4 mm. [Rain 4.4 mm; Max 13.2C; Min 8.2C; Grass 6.7C]
22nd: The rain was clearing away and the morning was bright. In the afternoon there was some dark looking cumulus clouds hanging around and eventually there were some spots of rain. The temperature rose to 14.5C, the highest this year so far. At 1553 there was a short shower of ice pellets. The sky began to clear later and at 21 GMT it was cloudless. The wind was a warm S-SW'ly and the temperature remained above freezing even on the grass. [Rain 0.1 mm; Max 14.5C; Min 7.1C; Grass 4.7C]
23rd: There was a sunny start to the day but it soon became cloudier. By 0900 GMT it was dull and, although bright at times with sunny interludes, the morning remained on the dull side with patchy cloud. A cumulonimbus cloud had developed and there was a shower at 1330 GMT, but it was not heavy and did not last long. Later it became sunny again for a while. Valley reported 11.7 h sunshine, the highest in the UK ( 24-h to 18 GMT). [Rain 2.4 mm; Max 13.3C; Min 7.5C; Grass 3.8C]
24th: Early rain had just ceased by 0900 GMT. The cloud was beginning to thin and it became brighter through the morning. There was plenty of cumulus around in the afternoon and a few deposited some drops of rain. These were clearing away by 1500 GMT and it became sunny and warm with the temperature reaching 15.1C. Cloud had cleared from the summits of the Snowdonia Mountains and patches of snow could be still seen above 2500 ft. By 2100 GMT there was moderate to heavy rain which more or less persisted to 0900 GMT the next day, accumulating 11.4 mm over 7.3-h duration. Rain 11.4mm; Max 15.1C; Min 6.6C; Grass 3.0C]
25th: Low cloud and continuous moderate rain at first eased soon after 0900 GMT. There was standing water on grass and soil plot. Through the morning cloud and mist was being driven along at low level through the Menai Strait from NE to SW. In the afternoon it was occasionally bright but there were several showers of light rain. [Rain 1.3mm; Max 13.7C; Min 7.6C; Grass 6.6C]
26th: The morning was dull with slight rain or drizzle at times. By noon the temperature was only 10.7C. The afternoon remained mainly dull, with slight rain of drizzle, but there was a bright spell when the temperature rose to 13.0C. From 1800 GMT it began to clear but turned misty for a while. [Rain 5.3mm; Max 13.0C; Min 8.2C; Grass 7.3C]
27th: There was a heavy shower of rain about 04 GMT amounting to 3.8 mm. At 0900 GMT there were signs of the sky clearing but it remained mostly dull at first with a few spots of rain from time to time. There was a little more blue sky at noon but there was another light shower later on. Towards evening the sky had cleared a little more. [Rain tr; Max 12.3; Min 5.8C; Grass 2.6C]
28th: The sky had remained clear overnight but the minimum had kept up to 5.0C while on the grass it was 1.3C. There was very heavy dew. Just before 0900 GMT cumulus cloud began to form overhead and later there was quite active looking clouds over central Anglesey. There was a little light rain around 1500 GMT then a long spell from 2300 GMT until 0900 GMT the next day as a rain area moved from the SE to NW across Wales. Anglesey was on the northernmost edge. Rainfall was 7.1 mm over 10.5-h duration. [Rain 7.1mm; Max 13.2C; Min 5.0C;Grass 1.3C]
29th: It was calm with continuous slight to moderate rain at dawn until 0900 GMT when the pressure was 1012.7 mb. The morning remained murky with slight drizzle at times. At noon the pressure was rising slightly and the afternoon, while dull at first, became clearer as the wind became SW'ly. By 1800 GMT the sky had become cloudless. Pressure at 2100 GMT was 1017.4 mb. [Rain tr; Max 13.7C; Min 8.0C; Grass 7.5C]
30th: A sunny start to the day and with only a very light NE'ly breeze it felt quite warm. An area of high pressure was extending from Norway to Scotland and the west. By noon the temperature had risen to 15.1C and it was to go on to rise to 16.5C, the highest of the month. Some cumulus clouds were seen to the SW and some sea fog was blowing into Red Wharf Bay. Here being more inland and at 107 m it remained cloudless, although hazy, with maximum sunshine. Valley reported 12.6 h of sunshine, most was atExmouth (14.0 h). [Rain nil; Max 16.5C; Min 6.1C; Grass 1.6C]
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1st: A sunny morning. At 0900 GMT it was calm with a temperature of 15.0C, dew point 7.8C. Pressure was at 1027 mb. A slight deposit of dust, light in colour, was seen on the hailpad. There was some cirrostratus to the S/SW and cumulus built up during the day over the Snowdonia Mountains. Here it remained sunny and the maximum reached 17.0C. During the afternoon the cumulus dispersed and the sky cleared. Valley reported a maximum of 18C and 13.9 h sunshine; the most sunshine was at Tiree (14.3 h) as the west enjoys a taste of early summer weather. [Rain nil; Max 17.0C; Min 7.8C; Grass 3.3C]
2nd:Sunny with thick haze. This looked slightly coloured, especially looking towards Liverpool Bay. With the bright sunshine that the west coast has enjoyed the last days the pollution smoke probably contains ozone. Quite high concentrations are formed in the west of Wales and Scotland when it is sunny. The temperature at 0900 GMT was 14.0C. By 1000 GMT the temperature was not rising much due to a cool NE'ly breeze off the sea but did reach 15.3C by noon. During the afternoon there was some weak cumulus cloud development over the mountains and to the N and NE of here for a while, but soon dispersed. It became less hazy and the wind decreased in the evening. [Rain nil; Max 16.7C; Min 8.1C; Grass 3.9C]
3rd: Another sunny day with cloudless sky at 0900 GMT. Later cloud was seen streaming off to the west of the mainland mountaintops. A cool day with the maximum only reaching 13.3C in a NE'ly breeze reaching force 4 at times. There was a little cumulus cloud passing by around 1500 GMT but this cleared later and gave clear skies again. [Rain nil; Max 13.3C; Min 7.4C; Grass 5.8C]
4th: A lot of tree pollen and bud scales were lying on the screen roof at 0900 GMT. The wind was still NE'ly with 6 oktas cloud cover and the temperature was a cool 8.3C. Later in the morning the sky cleared but the temperature at noon was only 11.3C. The afternoon and evening remained clear but hazy and the maximum reached 12.3C. [Rain nil; Max 12.3C; Min 7.5C; Grass 5.6C]
5th: Another sunny start to the day. Visibility was good but there was smoke pollution. At noon the visibility had deteriorated to poor and there was a little cloud to the NE and SW of the station. During the morning the temperature had risen to 14.3C and in the afternoon some cumulus clouds built up and later dispersed. It remained very hazy. There were many thunderstorms over France and Spain but had not yet reached the S coast of England. The first Anglesey grown potatoes of the season were on sale at Llanbedrgoch, a week earlier than last year, at £1.50 per kilo (68p per pound). At Brynsiencyn, asparagus was on sale for £2.50 for 340g. [Rain nil; Max 15.5C; Min 5.3C; Grass 3.6C]
6th: Sunny but with poor visibility in the thick haze. There was still a cool NE'ly breeze but the temperature was to go on to reach 19.5C. There was some cumulus cloud development early in the afternoon but this later dispersed. [Rain nil; Max 19.5C; Min 9.5C; Grass 7.4C]
7th: It had been a warm night with a minimum of 11.2C. At 0900 GMT there was some cloud to the S, otherwise clear. Visibility was poor in the thick haze. The NE'ly breeze remained light and the temperature reached 19.8C about 1300 GMT. There was more cloud development in the afternoon and for a while looked quite threatening to the S. It remained bright and sunny here but there was a shower, only spots of rain not enough to wet the ground or person, around 1500 GMT. It was later to clear to sunny again by the evening. [Rain tr; Max 19.8C; Min 11.2C; Grass 8.7C]
8th: Another warm night with a minimum of 10.5C. At 0900 GMT it was sunny and the temperature was 16.7C with a dew point of 8.6C (RH 59%). The wind was a light NNE'ly and the grass was dry! There were moderate deposits of tree pollen and bud scales. A sunny afternoon with the usual cool N-NE'ly breeze. Some small cumulus appeared to the S but again soon dispersed. Later the wind lessened and it became calm in the evening. At 1700 GMT the temperature of the dry soil at 5cm depth was 25.0C. [Rain nil; Max 18.6C; Min 10.5C; Grass 8.8C]
9th: A cloudless sky at 0900 GMT and although there was a breeze off the sea the temperature was 16.6C. The day continued sunny but the visibility was poor in the very thick haze. Early in the afternoon cumulus was seen over the mountains to the S for a while but these dispersed later. Storms over N France were moving along the Channel to the NE but there were only a few isolated showers over Britain including one in mid Wales and Snowdonia. [Rain nil; Max 19.5C; Min 10.5C; Grass 8.2C]
10th: Another cloudless start to the day but fog or low cloud could be seen in Red Wharf Bay. The morning was sunny with some haze but by noon the fog or low cloud had extended to here. This gradually thinned and later it was sunny again. In the evening the sky cleared as the wind veered E'ly and freshened to force 4. It remained windy until morning. [Rain nil; Max 17.3C; Min 9.7C; Grass 8.1C]
11th: A cloudy morning with the wind still a force 4 E'ly. There were several layers of cloud comprising cumulus, altocumulus and cirrus. There was heavy deposition of tree pollen on flat surfaces. By noon it was windier and several lee-wave clouds could be seen in the lee of the Snowdonia Mountains. Rainfall radar showed that showery rain had passed the station by, moving centrally up the Irish Sea. Lee-wave clouds still could be seen in the afternoon. It had become cloudier by 1500 GMT and there was a rumble at 1654 GMT but was thought not to be thunder. Spherics were not recorded in the area but the system may not register the odd occurrence. [Rain nil; Max 16.2C; Min 9.5C; Grass 8.4C]
12th: There have been 13 days without measurable rainfall. The hygrograph trace indicated that the relative humidity had dropped to 49% at 0400 GMT. The wind now E'ly could have been for a while SE'ly, off the mountains, resulting in the low humidity observed. A partially cloudy but bright morning with sunny spells when the temperature rose to 18.5C. The afternoon the sky cleared for a time and the temperature rose to 19.5C, we still have not recorded a 20C this year! By 1600 GMT the sky had become overcast and there was a little rain (0.2mm) about 0330 GMT on the 13th. [Rain 0.2mm; Max 19.5C; Min 8.9C; Grass 7.4C]
13th: The soil and paths were quite dry after the slight rain shower but the grass was wet. The wind was S'ly and there was weak hazy sunshine. The overnight minimum was 12.5C, the highest of the month. There were cumulus clouds in the vicinity and by noon it was quite murky although the temperature had risen to 18.7C. The afternoon remained murky at first, with fleeting glimpses of the sun raising the maximum to 19.5C, and gradually cleared to give a sunny evening. It was a clear moonlit night with a low mist across the fields by midnight. [Rain nil; Max 19.5C; Min 12.5C; Grass 11.3C]
14th: Early tufted and spiral cirrus clouds were diminishing by 0900 GMT. The temperature was a warm 19.5C equal to yesterday's maximum in a light SE'ly breeze with good visibility. There was a nice lenticular lee-wave cloud to be seen to the S of here. The wind remained a S-SE'ly and increased to force 3 by noon. The temperature went on to reach 24.1C by early afternoon. The first 20C, or more, and the highest of the month and year so far. Cloud encroached from the west by 1500 GMT but it remained warm. [Rain nil; Max 24.1C; Min 11.6C; Grass 8.5C]
15th: Rainfall radar showed rain in the Irish Sea just clipping west Anglesey in the night. It was trying to be bright early but soon was very murky with poor visibility. The grass was almost dry but there had been slight dew. The temperature rose to 15.7C before declining and there was the odd spit of rain felt on the skin. Temperature at noon was 13.6C. The afternoon continued dull at first before clearing from the west by 1400 GMT with good visibility. It was then sunny and the maximum reached 18.1C. By 1830 GMT it had become cloudier again. [Rain tr; Max 18.1C; Min 11.8C; Grass 8.8C]
16th: It was overcast but dry, including the grass at 0900 GMT. It was cooler with a temperature of 13.0C. By 1115 GMT there were the first spots of rain and the day remained dull, windy at times, with periods of rain. Pressure reached a low of 1006 mb at 1700 GMT before clearer weather appeared from the S. There was a further period of rain from 1100-0400 GMT. By morning 5.9 mm of rain had accumulated, over 9.6-h duration, the first substantial amount for 17 days. [Rain 5.9mm; Max 13.2C; Min 10.4C; Grass 9.4C]
17th: A bright start to the day in a blustery SW'ly wind force 5 at times. Much cooler with a maximum of only 11.7C. The afternoon had sunny spells but was showery. There were further heavier showers in the evening and before midnight, when the air temperature dropped to 6.2C, with slight ice pellets. There were further showers through the night. Total rainfall amounted to 8.3 mm, over 9.1-h duration, was the most during the month. [Rain 8.3mm; Max 11.7; Min 6.2C; Grass 5.6C]
18th: With the wind from the WNW the temperature at 0900 GMT was 8.7C. A slight shower was in progress but there were signs of the sky clearing. The wind remained WNW'ly and became force 3-4 by noon when the temperature had risen to 12.0C. There were good sunny spells in the afternoon but there was a shower later in the night. [Rain 0.4mm; Max 14.7C;Min 7.2C; Grass 6.0C]
19th: There were signs of the sky clearing in a NNW'ly wind, with a temperature of 9.8C, at 0900 GMT. Visibility was good, but there was cloud and mist on the summits of the Snowdonia Mountains. The morning was bright with occasional sunny spells. The afternoon was sunnier and by evening there was an almost clear sky. [Rain 0.1mm; Max 14.1C; Min 7.3C; Grass 6.5C]
20th: The overnight sky was clear and moonlit with the grass minimum falling to 3.5C. Cloud soon encroached from the west and by 0900 GMT it was overcast with slight rain. A very slow moving band of rain was crossing Ireland and affecting western coasts. The day remained murky with rain, heaviest around 1400 GMT, and with very poor visibility. A slow clearance began about 1800 GMT. Rainfall amounted to 3.8mm over 4.9-h duration. [Rain 3.8mm; Max 11.5C; Min 6.9C; Grass 3.5C]
21st: Slight rain and drizzle early was dying out and by 0900 GMT there was a break in the cloud cover. This was just a 'flash in the pan' as there were further slight rain or drizzle during the morning. After noon it became brighter and then quite sunny later when the wind had become NE'ly. [Rain 0.4mm; Max 15.4C; Min 6.6C; Grass 3.8C]
22nd: Overnight slight rain (1.5-h duration) from 01 GMT had already dried on concrete by 0900 GMT. Pressure had risen to 1015 mb as a weak ridge was affecting southern parts of Britain. There were cumulus clouds in the vicinity during the morning, which was mainly sunny and dry. Relative humidity fell to 48%, the lowest of the month. During the afternoon the sky cleared and by 1700 GMT was almost cloudless; with very good visibility there were stunning views to be seen across the Menai Strait to the Snowdonia Mountains and the Lleyn Peninsula. A local saying that if it is very clear it will soon rain was proved correct as there was cloud and rain from just before 01 GMT. [Rain 7.3mm; Max 15.0C; Min 8.0C; Grass 5.7C]
23rd: Overnight moderate rain had accumulated 7.3 mm by 0900 GMT and it continued until 1400 GMT. Visibility deteriorated to moderate fog during the morning. Total rainfall in this spell was 15.3 mm over 12.1-h duration. The sky did not brighten until 1600 GMT when there was an improvement in visibility and cloud began to lift. The evening was sunny. [Rain 8.0mm; Max 12.2C; Min 8.0C; Grass 7.0C]
24th: The overnight minimum had fallen to 6.0C and 2.3C on the grass, fairly cool for the time of year. The morning was bright with sunny spells. There were moderately active looking cumulus clouds in the vicinity at first, but there was no rain. Before noon the clouds were dispersing giving clear views across the Menai Strait towards Bangor and Snowdonia. In the afternoon cirrus replaced the cumulus and the maximum rose to 14.4C. [Rain 5.9mm; Max 14.4C; Min 6.0C; Grass 2.3C]
25th: Showers of ice pellets in the night about 01 GMT and 0620 GMT. The morning continued showery with some brighter periods but at noon there were dark active cumulus in the vicinity. At 1344 GMT there was thunder and a short heavy shower including ice pellets during which the temperature fell 4C to 7.5C. On the summit of Snowdon the temperature fell to -0.6C. Showers cleared away for a while later in the afternoon. A moderate shower at 2100 GMT included some hail over 5mm diameter. [Rain 2.2mm; Max 12.3C; Min 6.8C; Grass 4.7C]
26th: Continuous slight rain or drizzle in the morning. A brief respite 13-15 GMT before more of the same. The day maximum was only 10.5C, the lowest of the month. In all there was 6.0-h rainfall duration but only amounting to 3.8 mm. [Rain 3.8mm; Max 10.5C; Min 6.1C; Grass 3.5C]
27th: A bright start to the day but there were dark cumulus clouds in the vicinity at 0900 GMT. Cloud was just on the summits of the Snowdonia Mountains but his lifted off and the morning became quite sunny. Some active looking cumulus formed over the mountains around 1300 GMT but diminished later to give a sunny afternoon. It was a much better day here than had been forecast, but it was rather cool. There was a shower of rain and ice pellets at 2130 GMT. [Rain 0.2mm; Max 12.7C; Min 5.4C; Grass 3.2C]
28th: Some well-developed cumulus clouds around in the morning becoming cloudier by noon. Visibility was very good with clear views across Anglesey and the mainland. The sky cleared later to give a sunny end to the day and a cool night. Showers of rain at 03 GMT. [Rain 0.5mm; Max 13.5C; Min 4.6C; Grass 2.3C]
29th: The grass was wet from overnight showers but the soil surface was just dry enough to record as dry. The overnight minimum had fallen to 4.4C and to 1.3C on the grass, both lowest of the month and since 28 April. Pressure had risen to 1014.6mb and the morning was generally sunny and dry but with cumulus clouds in the vicinity. During sunny spells in the afternoon the temperature rose to 15.9C, the highest since the 15th. Valley (Anglesey) reported 14.4h sunshine in 24-h to 1800 GMT, the most in the UK. [Rain nil; Max15.9C; Min 4.4C; Grass 1.3C]
30th: Sunny at first with some cumulus high over the Snowdonia Mountains to the S. It turned cloudier by noon with very dark clouds to the S and W which produced a heavy shower in Pentraeth and Llanbedrgoch, but none at this station. The sky cleared later and the afternoon and evening was sunny. [Rain nil; Max 14.6C; Min 5.9C; Grass 2.6C]
31st: Weakly sunny through 6 oktas of cirrostratus cloud at 0900 GMT. Visibility was very good with the cliffs well picked out on the mainland mountains. It cloud became denser by noon and the S'ly breeze had increased to force 3. There was some rain from 1545 GMT and by evening the wind was force 5 at times. There were 3 periods of rain, heaviest from 22-01 GMT, which accumulated 6.2 mm over 9.2-h duration by morning.[Rain 6.2mm; Max 16.3C; Min 5.6C; Grass 2.1C]
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1st: A dull start to June with slight rain ceasing just before 0900 GMT. The day remained cloudy with intermittent slight rain or drizzle. The wind a S'ly force 3 increased S-SW'ly force 7 shredding and removing leaves and leafy twigs from trees, and beating down garden plants. RH remained above 90% for the 24-h period. Rainfall total was a small 1.0mm, but Capel Curig (mainland mountains) reported 41mm in the 24-h to 1800 GMT. [Rain 1.0mm; Max 13.7C; Min 10.8C; Grass 10.1C]
2nd: Overcast with spots of rain soon becoming continuous moderate then intermittent, accumulated 9.5mm over 8.7h duration, the most in a day in the month. Visibility remained poor or very poor throughout the day under the low fragmented clouds. RH again above 90% for the 24-h period. [Rain 9.5mm; Max 14.5C; Min 11.9C; Grass 11.6C]
3rd: The maximum for the 2nd (14.5C) occurred at 0800 GMT. By 0900 GMT the temperature had fallen to 13.8C and this was to be the maximum for the 3rd. Slight rain and drizzle at first, periods of moderate rain turning again to drizzle in the afternoon, poor visibility. Another 24-h with RH above 90%. [Rain 5.7mm; Max 13.8C; Min 11.8C; Grass 11.2C]
4th: The minimum (9.7C) was at 0800 GMT ending 23 h of falling temperature. Rarely, the grass minimum was higher having fallen to 10.2C. Dull at first but becoming brighter with a glimpse of the sun from time to time. The relative humidity fell to 80% by noon, and soon 76%, the lowest for three days. The day remained dry and the grass surface had even dried by 1500 GMT. [Rain nil; Max 15.0C; Min 9.7C; Grass 10.2C]
5th: Again 8 oktas of cloud somewhat higher today, but the mainland mountain summits remained covered. Visibility was good with a slight haze. It sky became very dark for a while but brightened towards noon. Things were looking up as the relative humidity at 0900 GMT was 87% and this fell to 76% by noon. There were small breaks in the cloud but it struggled to clear any more until late afternoon. The evening was sunny! [Rain tr; Max 14.6C; Min 8.4C; Grass 5.8C]
6th: At dawn it was dull, there was a bright period followed by an unmeasurably slight shower before 0900 GMT. By 10 GMT it brightened as the SW'ly wind veered W'ly. At noon the temperature had reached 15.8C with an RH of 66%. During the afternoon there was a slight shower but this cleared to give a sunny evening. [Rain tr; Max 16.7C; Min 9.3C; Grass 7.6C]
7th: At dawn it was cloudy but this soon cleared leaving lenticular cirrus to the SW at 0900 GMT. There were a few weak cumulus clouds to the S. A ridge of high-pressure was traversing S Britain but fronts over Ireland were moving NE. It became cloudier during the morning but as it was thin the sun was not totally obscured and the temperature rose to 15.5C by noon. The cloud was high and the mountain summits were cloud-free although the view was hazy. During the afternoon the cloud thickened and there was slight rain shower around 1930 GMT. [Rain 0.1mm; Max 15.5C; Min 7.3C; Grass 4.8C]
8th: The sky was clearing before 0900 GMT and the morning had some sunny spells. The wind was a force 5 S-SSE'ly and for a while it felt warm, however it was cloudier again by noon. There were showers at first in the afternoon but then these cleared away and it became bright and sunny for a while before turning cloudy again in the evening. There was rain by morning. [Rain 4.1mm; Max 15.0C; Min 11.0; Grass 9.4C]
9th: There was continuous moderate rain at 0900 GMT. An area of rain was covering Wales and several hours were forecast. The rain turned slight to drizzle for a while before becoming moderate again around noon. There was 5.5-h rainfall duration measuring 5.1 mm. The totals for the event commencing 0315 GMT on the 8th was 9.3 mm over 10.6 h. There was a bright interval in the evening but the daytime temperature reached only 9.5C. The day's maximum did not occur until 0900 GMT on the 10th. [Rain 5.1mm; Max 13.0C; Min 9.0C; Grass 7.6C]
10th: Overnight the minimum had fallen to 7.0C and to 4.0C on the grass, both the lowest of the month. Fair weather cumulus were being driven along with a force 4 SW'ly at 0900 GMT. The morning became sunnier before once turning cloudier by noon. The afternoon again turned sunnier with a maximum of 15.3C but remained windy, force 6 at times. It was cloudier again from 1600 GMT as a thin rain band crossed the Irish Sea and deposited 0.9mm rain from 1715 GMT. [Rain 0.9mm; Max 15.3C; Min 7.0C; Grass 4.0C]
11th: A cloudy, dull and windy day. The force 4 SW'ly became a blustery force 6 in the afternoon and there was a slight shower which did not wet the rain collection bottle. [Rain tr; Max 14.5C; Min 8.3C; Grass 6.3C]
12th: Another dull start to the day. Although pressure was continuing to rise slowly (1020mb) a deepening low to the NW (978mb) would bring severe gales to Scotland. The ground and grass was dry in the force 5-6 S'ly wind. The overnight temperature had dropped to only 11.9C and 11.6C above the grass. The afternoon was windier and though brighter for a while the low cloud and mist soon returned with drizzle later. The wind a force 6-7 SSW'ly was tearing leaves from trees and damaging summer flowering plants in the garden. The evening was blustery. [Rain 1.3mm; Max 16.6C; Min 11.9C; Grass 11.6C]
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1st: A cloudy dawn with slight rain from 07 GMT (0.3mm). It was calm at 0900 GMT with some spots of rain still falling in poor visibility. It remained overcast but did become brighter during the morning and the highest temperature of the day (18.9C) was reached soon after noon. It had just started raining, however, as a band of rain which had moved up through Wales had arrived and appeared to remain stationary here for a while. Amount of rain was small (0.9mm) over 1.2-h duration. By 1730 GMT it had brightened and the sun appeared fleetingly but there was no clearance until nightfall (2130 GMT). The night became clear and starlit and, with no moon, the northern sky was palely lit above the horizon until after midnight. [Rain 0.9mm; Max 18.9C; Min 13.2C; Grass 11.5C]
2nd: Pressure was low to the SW and the gradient was slack over the UK. It had clouded over by dawn but brightened just before 0900 GMT. There was a very light NE'ly wind and visibility moderate although hazy. It was cloudier by noon before a period of frontal rain, moderate at first, deposited 4.0mm over 3.1-h duration. The afternoon brightened eventually with the usual glimpse of the sun before the sky became overcast once more. At Chester a heavy thunderstorm in the evening caused flooding in the centre of City. [Rain 4.0mm; Max 16.7C; Min 11.4C; Grass 8.5C]
3rd: There was a slight shower of rain around dawn and chinks of blue sky appeared in the low cloud around 0900 GMT. The temperature (16.7C) had already equalled yesterday's maximum. The morning remained cloudy and there was rain from 11 GMT. At noon the temperature was 18.3C and it was very murky with poor visibility. The rain ceased in the afternoon becoming bright and sunny for about 2 h before becoming cloudier again by evening. At Colwyn Bay there was heavy thundery rain causing flooding of some roads and at Llanrwst (Conwy Valley) heavy rain caused flooding and damage to walls in the town. In Chester, for the 2nd evening, there was a heavy thunderstorm. [Rain 1.3mm; Max 19.0C; Min 12.7C; Grass 10.4C]
4th: Overcast and dull but still feeling reasonably warm in the light NE'ly breeze, the overnight minimum was 14.0C. Temperature at 0900 GMT was 16.3C (dew point 14.4C) and visibility was poor in thick haze. The morning became brighter with a little sunshine but by noon dark clouds were threatening to the S. By afternoon the dark clouds had receded and it became mostly sunny with a maximum of 19.2C in patchy thin cloud. Later it became misty. [Rain nil; Max 19.2C; Min 14.0C; Grass 12.5C]
5th: There was thick fog at 02 GMT this thinning to very poor in mist at dawn. By 0900 GMT it was becoming sunny with only thin cumulus clouds overhead. By noon (17.2C dewpoint 14.3C) it was cloudier with threatening cumulus clouds to the S over the mainland mountains. There was a localised heavy thundery shower at the Britannia Bridge at 14 GMT but it remained dry here. Coastal fog had affected Valley (Holyhead) and Aberporth during the day. During the night it once more became foggy. [Rain nil; Max 19.8C; Min 12.6C; Grass 11.6C]
6th: A shallow depression was over the Irish Sea, with weak fronts moving SE. There was a change of wind direction from the NE'ly of past days to the SW at 0900 GMT. There were towering cumulus clouds over Snowdonia to the S and to the W. Overhead there was thin patchy altocumulus. The maximum during the morning was 19.0C and was not to be exceeded during the day. Before noon it became cloudier and murky and the NE'ly wind had resumed. Towering cumulus clouds were still in the vicinity, but again it kept dry and bright at times into the evening before becoming cloudier overnight. [Rain nil; Max 19.0C; Min 12.0C; Grass 9.5C]
7th: A dull start to the day and it was cooler (12.5C, dewpoint 9.8C at 0900 GMT), but the cloud was lifting and the visibility was good. During the morning the cumulus clouds started to disperse and cleared the summits of the Snowdonia Mountains, and it became sunny with good visibility in a clearer airstream. The afternoon was sunny at first but cloudier from 15 GMT and more so by evening. By 19 GMT the wind was SSW'ly. [Rain 0.3mm; Max 16.3C; Min 11.7C; Grass 10.6C]
8th: A slight shower at 03 GMT and another just before 0900 GMT. The wind was NW'ly and there were cumulus shower clouds in the vicinity and the summits of the Snowdonia Mountains were cloud covered. There were some bright and sunny spells during the morning. In the afternoon the wind turned to a SSW'ly force 4, there was drizzle then rain from 1530-2115 GMT amounting to 5mm. [Rain 5.2mm; Max 16.2C; Min 11.4C; Grass 11.0C]
9th: Pressure was falling (999mb) as a deepening depression (992mb) over the N of the UK was moving slowly E. There was intermittent slight rain or drizzle during the morning but the afternoon was dry though cloudy and hanging low over the mainland mountains. By evening it brightened and there were a few sunny spells. An area of rain, moving from the N, brought rain from midnight amounting to 13mm by morning. [Rain 13.5mm; Max 16.8C; Min 12.5C; Grass 12.4C]
10th: Pressure dropped to 992mb between midnight and 04 GMT, this was very low for the time of year. Overnight rain stopped at 0845 GMT but there was a fresh N'ly wind, strong enough to be bringing down twigs and leaves from nearby trees. At 0900 GMT the temperature was 11.0C and the morning remained cloudy. Before noon the temperature had reached only 12.9C. It was to rise to 14.1C in the afternoon, during an occasional sunny spell, the lowest of the month. It kept dry but it remained windy, force 6 gusting force 7 at times. In exposed places on the island some damage to trees, especially ash that tends to be rather brittle, was being done. [Rain 1.3mm; Max 14.1C; Min 10.0C; Grass 9.5C]
11th: Early rain and a shower about 07 GMT cleared away to give sunny spells during the morning. Visibility was very good but there was cloud on the summits of the Snowdonia Mountains. Some passing clouds looked dark but there was no rain. The NE'ly wind increased to force 5 by noon. The afternoon was partly cloudy, when it felt cold in the wind, but the maximum reached 15.3C when sunny. The thermograph trace was quite jagged responding to the sunny and cloudy conditions. By evening the wind had dropped. The night was partly cloudy. The sky became overcast by morning. [Rain nil; Max 15.3C; Min 8.7C; Grass 7.5C]
12th: In a clear spell the temperature on the grass dropped to 5.7C, the lowest of the month. Cloudy at dawn, then a few small breaks in the cloud but it did not clear. The morning was warmer than yesterday reaching 15.7C by noon. Despite the cloudy afternoon the temperature rose to 16.7C as the NW'ly wind backed to S-SW'ly. During the evening there was a spell of fine drizzle followed by an 8-h period of rain from 2030 GMT amounting to 3.5mm. [Rain 3.5mm; Max 16.7C; Min 9.1C; Grass 5.7C]
13th: Early rain and drizzle had ceased by 0900 GMT. The minimum and grass minimum thermometers read the same (12.0C). The morning remained dull but the cloud thinned and it brightened with one or two small patches of blue during the afternoon. There was a shower of rain at 23 GMT. [Rain 0.7mm; Max 16.4C; Min 12.0C; Grass 12.0C]
14th: In the NW'ly wind the day remained cloudy. There were occasional bright spells, when the cloud thinned and veiled glimpses of the sun appeared. [Rain nil; Max 16.7C; Min 10.9C; Grass 9.8C]
15th: It was partly cloudy at dawn but soon became overcast by 0900 GMT. The sky began to clear before noon when the temperature had reached 16.0C. There were cumulus clouds in the vicinity but they did not look threatening and it remained dry. There were some sunny spells later. On the mainland Snowdon remained covered in cloud once again, disappointing visitors who had made the journey to the top on the narrow gauge rack and pinion railway. Today was St. Swithin's day and it did not rain! [Rain nil; Max 17.2C; Min 10.0C; Grass 7.6C]
16th: Pressure was slowly rising (1022 mb) as the Atlantic high, which seems to have been there for ages, was edging closer. Cloudy at first but sunnier later in the morning. At noon there were again cumulus clouds all around but the afternoon remained mostly sunny. The cloud slowly dispersed clearing the mountaintops by late afternoon. The evening and night was clear with a full moon. No aurora was seen although the possibility had been forecast. [Rain nil; Max 17.5C; Min 9.8C; Grass 7.9C]
17th: There was shallow mist over the fields at 04 GMT as the moon was setting to the SW. The pinkish colour of the sky and moon is the result of light passing through the atmosphere containing pollution smoke. The mist had cleared away by 0900 GMT leaving moderate dew on the grass. The minimum temperature had dropped to 8.5C one of the 2 coolest night in the month (5.8C on the grass) the coldest since 25 June. The day was moderately sunny although there were clouds to the S and W, and on the summits of Snowdonia. At dusk there was further shallow mist across the fields. [Rain nil; Max 18.5C; Min 8.5C; Grass 5.8C]
18th: Another cool night with a minimum of 8.5CA sunny start to the day with just a little cloud low to the S and W and cirrus overhead. During the day a strong sea breeze front developed across Anglesey NW-SE as air off the sea from the NE converged with that from the SW. It persisted from about 10 GMT to after 18 GMT. Valley (Anglesey) recorded the most sunshine in 15.4h (24-h to 18 GMT). [Rain nil; Max 21.2C; Min 8.5C; Grass 5.9C]
19th: Another sunny day. At 0900 GMT there were some small cumulus over the mountains to the S, patches of lenticular cirrostratus to the SW and a little altocumulus overhead. During the morning it became cloudier but the temperature reached 21.0C at noon with 56% RH. The maximum reached 22.1C during the afternoon, the highest of the month, and the sky cleared towards evening. [Rain nil; Max 22.1C; Min 10.7C; Grass 8.3C]
20th: A cloudy start to the day with pollution smoke visible to the S and in Liverpool Bay. The sky was clearer (3 oktas) before noon but the smoke intensified particularly in Liverpool Bay as viewed across Malltraeth marsh towards Red Wharf Bay. The afternoon had patchy cloud from time to time with a maximum of 19.1C whereas on the west coast, at Aberffraw, it was clear and warmer. Temperature of the sea at 1m from the shore was 18C but it was up to 21C nearer the shore. [Rain nil; Max 19.1C; Min 12.7C; Grass 11.2C]
21st: The day started sunny with a cloudless sky. At 0800 GMT pollution smoke was seen to 3000ft to the S-SW. By 0900 GMT small cumulus clouds had developed in Red Wharf Bay and over Snowdon and the Carneddau Mountains. The clouds over the mountains increased during the day but did not look very active. The afternoon remained sunny and the pollution smoke intensified. Later the cloud dispersed leaving dark smoke to a clearly defined boundary layer of clear air at a height of 5000ft at 1900 GMT looking towards Snowdonia. Valley (Anglesey) recorded 14.7h sunshine (24-h to 18 GMT). The night had a clear sky. [Rain nil; Max 20.2C; Min 9.3C; Grass 6.2C]
22nd: Pressure was declining (1026mb) as the anticyclone drifts N over Scotland. It was a warm night with a minimum of 14.5C, the warmest of the month. A sunny start to the day with a temperature of 18.0C at 0900 GMT. The grass was dry except in shady places. The day was sunny, hazy with a little cirrus and became windier in the afternoon force 4/5 NE'ly. Towards evening the wind lessened veering more E-ESE'ly. The maximum here was 21.5C but at Llanbedr (west coast of Gwynedd), in the lee of the Snowdonia Mountains, a maximum of 27C was reported, the highest in the UK. [Rain nil; Max 21.5C; Min 14.5C; Grass 12.5C]
23rd: Another sunny start to the day with some cirrostratus over Liverpool Bay and patchy cirrus above. The wind was ESE'ly and there was also cloud spilling over the Snowdonia Mountains and into the Nant Ffrancon Pass. Visibility was good but with thick haze the western part of the Lleyn Peninsular and Bardsey Island was obscured all day. During the afternoon the high cirrostratus increased edging towards the west coast of Anglesey which remained clear, Valley was the sunniest in the UK recording 14.7h (24-h to 18 GMT). [Rain nil; Max 19.5C; Min 11.5C; Grass 9.5C]
24th: Pressure continued to decline slowly (1015mb). A bright start to the day but became cloudier as 0900 GMT approached. Liverpool Bay looked very dull and there was a cool ENE'ly wind (14.3C dewpoint 12.6C). For the 3rd morning the grass was dry. Towards noon the sky began to clear and the afternoon was generally sunny with a maximum of 18.0C but it was very hazy. In the evening it was cloudier and became dull. [Rain tr; Max 18.0C; Min 11.8C; Grass 8.5C]
25th: A misty murky dawn with some fine drizzle at 0630 GMT. The morning remained misty with light drizzle at times. The afternoon was similar at first until the cloud thinned later and eventually one or two blue patches appeared. This clearer sky did not last long and the evening and night became overcast. [Rain tr; Max 16.0C; Min 13.1C; Grass 12.4C]
26th: Early drizzle turned to a period of light rain around 0900 GMT before easing in about an hour. There was a shower just before noon when the cloud appeared thinner and it was occasionally bright. During the afternoon there was a break in the clouds and the temperature popped up to 21.0C. It was soon cloudy again with a little more drizzle around 16 GMT. The evening and night was partly cloudy. [Rain 1.2mm; Max 21.0C; Min 11.3C; Grass 9.4C]
27th: A sunny start to the day with cumulus and altocumulus of 5 oktas. At 0900 GMT the temperature was 18.0C and overhead 2 buzzards were circling. It was cloudier before noon, with good but hazy visibility, when the temperature had reached 20.8C. The sky cleared during the afternoon and became sunny for a while before a heavy thundery shower at 1736 GMT (4.8mm in a few minutes). The evening and night remained overcast. [Rain 5.5mm; Max 20.8C; Min 12.3C; Grass 8.6C]
28th: It was misty with very poor visibility at dawn but improved to moderate by 0900 GMT. It had been a warm night with a minimum of 14.2C. The low fragmented cloud was slow to clear until just before noon. The temperature was 18.0C and there were moderately developed cumulus in the vicinity but were towering to the S. The afternoon became sunnier (maximum 21.0C) and the cumulus clouds continued to tower over central Snowdonia then later more so to the E and W. Anglesey had a clear sky much of the time with sunshine until dusk. Later in the night it was cloudier. [Rain 0.1mm; Max 21.0C; Min 14.2C; Grass 12.1C]
29th: There was a slight shower at 05 GMT and there was a misty start to the day with very poor visibility. By 0900 GMT the mist was clearing and the cloud appeared to be breaking up but there was soon a moderate shower. There was further light rain around noon then a heavy thundery shower at 1225 GMT. The localised deluge lasted for 12-15 minutes and accumulated 16.2mm, equivalent to an average of 65mm per hour. This led to a lot of standing water around the house. On the road outside traffic was almost brought to a halt. This was nearly the greatest 24-h fall in the UK on the day as Lough Fea reported 19.1mm. Later in the afternoon the sky cleared and it was sunny into the evening. [Rain 18.4mm; Max 19.3C; Min 13.9C; Grass 12.4C]
30th: A sunny start to the day but cumulus clouds were already towering over Snowdonia at 0900 GMT. In a light SW'ly and a temperature of 18.7C fair-weather cumulus were passing quickly overhead. By noon the temperature had risen to 21.2C, the day's maximum. The afternoon remained mostly sunny but there were some dark clouds from time to time and a spot or two of rain. The evening turned cloudier and there was slight rain from 2100 GMT becoming moderate from 03 GMT. By morning 7.4mm rain had accumulated over 7.8-h duration. [Rain 7.8mm; Max 21.2C; Min 12.7C; Grass 9.8C]
31st: Another warm night with a minimum of 14.3C. A dull start to the day with thick mist and slight rain that was showing signs of clearing away just before 0900 GMT. It soon turned back to rain and there were 4mm between 09-11 GMT as a front moved across from Ireland. Further thundery bursts of rain continued until 17 GMT when it became drier until 21 GMT when there was a further shower. In all 6.6mm accumulated over 6.3-h duration. Valley reported heavy rain in the morning returning a total of 35mm in the 24-h to 1800 GMT; 28.4mm 09-09 GMT. The sky cleared later in the night. [Rain 6.6mm; Max 17.4C; Min 14.3C; Grass 13.4C]
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1st: There was an almost clear sky at dawn but it became cloudier by 0900 GMT. There was a weak low over Rockall expected to move E'wards. The morning was bright with some sunny spells; cumulus clouds could be seen to the S and here they were passing by and dispersing. By noon the temperature had risen to 18.5C and Anglesey had become almost clear of cloud. Over Snowdonia towering cumulus remained during the afternoon. It was windy, the S'ly reaching force 4-5 at times. [Rain 11.9C; Max 19.6C; Min 13.2C; Grass 11.7C]
2nd: There was moderate to heavy rain from 0445-06 GMT. At 0900 GMT the clouds were low and ragged and a few small breaks soon appeared. The sky had not cleared by noon but it remained dry. The afternoon was bright with occasional glimpses of the sun and a few spots of rain. It was again windy with a SW'ly force 5-6. There was a shower around 16 GMT and a period of moderate to heavy rain from 23-03 GMT. At its heaviest from 00-0120 GMT 21.7mm fell at an average rate of 16mm per hour. Rainfall over the 24-h period was 25.2mm over 4.3h. [Rain 25.2mm; Max 17.7C; Min 13.7C; Grass 13.2C]
3rd: Heavy overnight rain had stopped but the sky was very dark and the morning remained murky with poor visibility. At noon it was the same, with a temperature of 14.8C, but the sky began to clear by 15 GMT to give some sunny spells the temperature rising to 18.9C. [Rain nil; Max 18.9C; Min 11.8C; Grass 11.4C]
4th: At 0900 GMT the cloud appeared to be breaking up and lifting from the tops of the mainland mountains. This was just 'a flash in the pan' as it soon was overcast and dull once more. By noon the temperature was 15.5C, the daytime maximum. The afternoon remained very dull with a little drizzle. By evening the sky was clearing and 'pile-of-plates' clouds were seen to the north of the mountains at 1930 GMT. The maximum for the 24-h of 16.5C was one of the 2 lowest of the month. [Rain tr; Max 16.5C; Min 10.6C; Grass 7.2C]
5th: Overnight the sky had cleared and at dawn it was cloudless except for patchy cloud low over Liverpool Bay. It was sunny at first with the temperature rising to 16.5C by 0900 GMT, the maximum for the past 24h. It became cloudier for a while but then cleared except for some patchy thin high cloud. The afternoon was sunny at first, the temperature reaching 20.8C, before it became cloudier from the west around 15 GMT. There was drizzle from 1730 GMT then a period of light rain for 1.6h to 1930 GMT. [Rain 0.7mm; Max 20.8C; Min 13.1C; Grass 9.5C]
6th: It was a warm night with a minimum of 15.4C. There was drizzle from 0730 GMT but it had ceased by 0900 GMT. The temperature was 17.2C but the sky was overcast and dull. Visibility was good, but the cloud remained low and unbroken except occasionally a break appeared overhead during the afternoon. The maximum for the day was 20.7C around 15 GMT. There were a few spots of rain then a slight shower around 17 GMT. [Rain 0.3mm; Max 20.7C; Min 15.4C; Grass 15.3C]
7th: Another warm night with a minimum of 15.0C. There was fog between 05-0630 GMT and was thick (less than 100m) between 0530-0600 GMT. At 0900 GMT visibility was still very poor and there was intermittent slight drizzle for a time. The day remained overcast and very dull. The sky brightened in the evening but did not clear. [Rain 3.3mm; Max 18.1C; Min 15.0C; Grass 13.6C]
8th: There was rain from 05 GMT, moderate at times, that continued until 10 GMT before turning to drizzle. It became calm around noon and the cloud was lifting. A heavy shower at 1245 GMT deposited 3.8mm rain in a few minutes. During a sunny spell the temperature rose to 20.6C. After a further slight shower the sky was clearing by 1800 GMT. [Rain 4.0mm; Max 20.6C; Min 14.7C; Grass 13.4C]
9th: A cloudy start to the day but visibility was good. The temperature at 0900 GMT was 17.7C in a fresh S'ly wind. A weak low to the NW was tracking E'wards. There were some bright and occasionally sunny periods with light blustery showers during the morning. A period of rain in the afternoon died out later but it remained damp and misty into the night. [Rain 7.0mm; Max 17.8C; Min 14.4C; Grass 13.3C]
10th: Spells of drizzle or light rain from first light. Another miserable misty day with intermittent slight drizzle. The clouds remained fragmented and low, it brightened a little later in the afternoon but the gloom soon returned. [Rain tr; Max 17.5C; Min 14.5C; Grass 14.2C]
11th: There were signs of the sky clearing just before 0900 GMT. Visibility was good and there were soon some sunny spells. At Beaumaris boats taking part in the annual Menai Strait's Regatta Fortnight were racing along in a force 4 SSW'ly. The clearance continued until, at 14 GMT, the sky became cloudless. The temperature rose to 21.0C. Later frontal cloud could be seen encroaching from the west and it reached here about 18 GMT. [Rain tr; Max 21.0C; Min 13.4C; Grass 11.2C]
12th: It was overcast at dawn with some spots of drizzle from time to time. Small patches of rain were moving northwards over the Irish Sea. There was an Atlantic low (980mb) to the W of Scotland with an associated cold front over Ireland. As the front moved across in the afternoon there was a period of rain lasting until 21 GMT (9.8mm over 6.4h). It was wetter at Valley (Anglesey) where 16.3mm were recorded to 1800 GMT, the most in the UK. [Rain 9.9mm; Max 18.1C; Min 13.4C; Grass 11.0C]
13th: A misty start to the day. Although the mist was clearing at 0900 GMT the morning remained dull and overcast. At noon, although still cloudy, the temperature was 19.8C in a light SSE'ly breeze. There was a brief bright spell when the temperature rose to 20.3C before a spell of rain commenced at 14 GMT accumulating 7.2mm by 20 GMT. A further spell from 05 GMT accumulated a further 4.5mm by 0900 GMT the next day. Rainfall 7.9-h duration. [Rain 11.7mm; Max 20.3mm; Min 15.7C; Grass 15.2C]
14th: Low pressure over N. Scotland and complex fronts along the spine of the UK. Rain and fog between 07-09 GMT eased a little before further light rain and drizzle during the morning. The overnight minimum was 15.9C, the highest of the month. The rain ceased and the sky began to clear after 1500 GMT. The rest of the afternoon was bright and sunny. It was wetter along the North Wales coast. In the 24-h to 1800 GMT Colwyn Bay had 16mm rain while Prestatyn recorded 29mm, close to the UK highest total of 30mm at Crosby (Liverpool, Sefton). [Rain 4.5mm; Max 17.7C; Min 15.9C; Grass 15.2C]
15th: It was a cooler night with a minimum of 11.5C. But it was cloudy before dawn and, although it was bright around 0900 GMT, it was soon raining in a brisk SW'ly wind. It was a wet start for the first day of the annual Anglesey Show held at Mona. Brighter though showery weather arrived by 1330 GMT. During the afternoon cloud was clear of the summits of Snowdonia and visibility was very good. A moderately active cumulus cloud had developed overhead around 1530 GMT, which resulted in a light shower. Anglesey had a bright and occasionally sunny end to the day. For the 24-h ending 1800 GMT Capel Curig (Gwynedd) reported 16mm rain, the largest fall in the UK. [Rain 4.4mm; Max 18.5C; Min 11.5C; Grass 9.6C]
16th: There was a weak low (1005mb) to the west of Ireland and with higher pressure over France (1022mb) there was a SW'ly airflow over the British Isles. It was a cloudy start to the day but by 0900 GMT breaks were appearing in the cloud. The morning was generally sunny with the wind, a force 3 SSW'ly, soon increasing to force 4-5. A heavy and prolonged shower to the S at 1230 GMT resulted in only a few spots of rain here. Later the sky cleared and it was a sunny end to the day with less wind towards dusk. [Rain tr; Max 18.8C; Min 10.6C; Grass 8.3C]
17th: It had been a cool night with heavy dew on the grass. There were active cumulus clouds in the vicinity as early as 08 GMT. The morning was sunny and the cumulus became less threatening as the day progressed. The afternoon was also sunny with rapidly passing fair-weather cumulus clouds in a WSW'ly force 4-5. [Rain nil; Max 18.8C; Min 10.6C; Grass 7.3C]
18th: Pressure was low (1009mb) with slack gradients over the British Isles. A sunny morning with very good visibility looking towards the cloud-free summits of Snowdonia. There were small passing cumulus with more active clouds to the S. By noon the temperature had risen to 19.0C and the relative humidity had fallen to 52%. Soon afterwards 19.4C was reached but then a cool NE'ly breeze off the sea lowered temperature and raised humidity. Clouds formed overhead as a sea breeze front developed as the cool moist air from the NE met the warmer and drier SW'ly. The afternoon was partly cloudy but on the beach at Aberffraw, on the west coast of Anglesey, it remained sunny and warm. To the SE of here a band of rain, moderate-heavy in the SW (Ross-on-Wye 18mm in 24-h to 18GMT) passed by during the day. An outlier of this rain reached here about 18GMT but only resulted in 0.8mm rain. [Rain 0.8mm; Max 19.4C; Min 10.3C; Grass 6.2C]
19th: A bright and sunny start to the day but at 0900 GMT (14.5C in a light NW'ly breeze) there were already towering cumulus clouds just to the S of here. Visibility was good but there was cloud on the summits of Snowdonia. With an Atlantic high (1030mb) S of Greenland, pressure was still low (1008mb) over the UK with slack gradients and fronts lying on the Welsh border and to the SE. During the morning there was a slight shower of rain then a heavy shower, including ice pellets, between 1113-1122 GMT which accumulated 3.7mm. The afternoon was mainly cloudy but there were frequent sunny spells. A waterspout was reported offshore at Colwyn Bay during the afternoon. Cloud dispersed during the evening and the night was clear and moonlit. [Rain 3.7mm; Max 18.6C; Min 10.8C; Grass 9.5C]
20th: Clear skies and calm overnight with a minimum of 8.8C and 6.5 on the grass led to heavy dew. The minimum of 8.8C was one of the 2 lowest of the month. With a low (999mb) S of Norway and Atlantic high (1033mb) drifting closer pressure had risen here (1015mb). A sunny start, with almost clear skies, but by 0830 GMT cumulus clouds were bubbling up to the SW over the Lleyn Peninsular. On Anglesey cumulus development continued with cumulonimbus clouds seen to the N. During the morning there were heavy thunderstorms off the NE Anglesey coast and Amlwch. An eyewitness situated in sunshine at Mynydd Bodafon described purple coloured cloud in an arc from Wylfa Head, out to sea, to Llanddona with double forked lightning and loud thunder. Cold downdraughts of air were reported at Amlwch and Mynydd Bodafon. An observer at Red Wharf Bay described seeing limited cloud vortex rotation and the wind veering from NW to NE. Thunder was heard and lightning seen from 1130-1140 GMT. At this station a temperature drop of 8C occurred from 1140-1320 GMT, the most rapid fall of 3.5C started at 1300 GMT. Heavy rain from 1300 GMT including moderate hail, with some stones estimated to be between 10-15mm diameter (MO code 6, TORRO size 2 H0), almost covered the ground but no damage has been reported. Rain and hail, heaviest over a period of 10 min with the total event lasting less than 20 min, accumulated 10.3mm. This was almost the largest fall in the UK as Aviemore reported 10.9mm in 24-h to 1800 GMT. On the west coast of Anglesey, from Newborough to Holy Island, it remained sunny most of the day with Valley returning 14.1h sunshine in the 24-h to 1800 GMT, the highest in the UK. At 1825 GMT slow moving showers of rain along the Menai Strait from Bangor towards Conwy produced, with the sun low in the W, an incomplete but vivid rainbow with secondary arc lasting at least 30 min. [Rain 10.7mm; Max 17.9C; Min 8.8C; Grass 6.5C]
21st: Clear starlit sky at times overnight (minimum 9.0C) but a little rain from 07-08 GMT of 0.4mm. Atlantic low (1009mb) west of Ireland. At 0830 GMT there were cumulonimbus clouds to the N of Anglesey and soon to the S and SW of the station. On the Lleyn Peninsular it was reported that before 06 GMT Pwllheli, and neighbouring villages of Chwilog, Llanbedrog, Llangybi and Y Ffôr had rain and hail over nearly 2h that caused local flooding and accumulations of level hail several cm deep and, in places, 30cm or more. Some shops in Pwllheli were un